I got to step 15 but couldn't get optirun to work.
In the guide it doesn't look like we are disabling nouveau anywhere, shouldn't this cause a conflict with the Nvidia driver loading?

root@DEFNOTKALI:~# lspci | egrep 'VGA|3D'
00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06)
01:00.0 3D controller: NVIDIA Corporation GK104M [GeForce GTX 870M] (rev a1)
root@DEFNOTKALI:~# modprobe nvidia
root@DEFNOTKALI:~# modprobe nvidia-uvm
root@DEFNOTKALI:~# optirun glxspheres64
[  146.023065] [ERROR]The Bumblebee daemon has not been started yet or the socket path /var/run/bumblebee.socket was incorrect.
[  146.023114] [ERROR]Could not connect to bumblebee daemon - is it running?
root@DEFNOTKALI:~# /etc/init.d/bumblebeed start
[ ok ] Starting bumblebeed (via systemctl): bumblebeed.service.
root@DEFNOTKALI:~# optirun glxspheres64
[  166.013170] [ERROR]Cannot access secondary GPU - error: [XORG] (EE) 

[  166.013201] [ERROR]Aborting because fallback start is disabled.
root@DEFNOTKALI:~# dmesg | tail -n 100
[    8.332790] [Firmware Bug]: ACPI(PEGP) defines _DOD but not _DOS
[    8.333960] ACPI: Video Device [PEGP] (multi-head: yes  rom: yes  post: no)
[    8.333964] ACPI Error: [\_SB_.PCI0.GFX0.DD02._BCL] Namespace lookup failure, AE_NOT_FOUND (20150930/psargs-359)
[    8.333968] ACPI Error: Method parse/execution failed [\_SB.PCI0.PEG0.PEGP.DD02._BCL] (Node ffff8802270e2220), AE_NOT_FOUND (20150930/psparse-542)
[    8.334106] input: Video Bus as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:5e/LNXVIDEO:00/input/input16
[    8.335503] ACPI: Video Device [GFX0] (multi-head: yes  rom: no  post: no)
[    8.335609] input: Video Bus as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:01/input/input17
[    8.373529] intel_rapl: Found RAPL domain package
[    8.373580] intel_rapl: RAPL package 0 domain dram locked by BIOS
[    8.396062] [drm] GMBUS [i915 gmbus vga] timed out, falling back to bit banging on pin 2
[    8.540116] snd_hda_intel 0000:00:03.0: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
[    8.540124] [drm] Initialized i915 1.6.0 20151010 for 0000:00:02.0 on minor 0
[    8.553731] fbcon: inteldrmfb (fb0) is primary device
[    8.587479] ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs'
[    8.599189] input: HDA Intel HDMI HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:03.0/sound/card0/input18
[    8.599255] input: HDA Intel HDMI HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:03.0/sound/card0/input19
[    8.599310] input: HDA Intel HDMI HDMI/DP,pcm=8 as /devices/pci0000:00/0000:00:03.0/sound/card0/input20
[    8.865906] Netfilter messages via NETLINK v0.30.
[    9.768266] Console: switching to colour frame buffer device 400x112
[    9.776747] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[   17.625014] fuse init (API version 7.23)
[  132.106742] nvidia: module license 'NVIDIA' taints kernel.
[  132.106746] Disabling lock debugging due to kernel taint
[  132.114807] nvidia 0000:01:00.0: enabling device (0006 -> 0007)
[  132.114995] [drm] Initialized nvidia-drm 0.0.0 20150116 for 0000:01:00.0 on minor 1
[  132.114998] NVRM: loading NVIDIA UNIX x86_64 Kernel Module  352.79  Wed Jan 13 16:17:53 PST 2016
[  138.579100] nvidia_uvm: Loaded the UVM driver, major device number 247
[  163.380537] bbswitch: version 0.8
[  163.380544] bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
[  163.380549] bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.PEGP
[  163.380560] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20150930/nsarguments-95)
[  163.380653] bbswitch: detected an Optimus _DSM function
[  163.380667] bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on
[  163.383584] nvidia_uvm: Unregistered the UVM driver
[  163.400337] [drm] Module unloaded
[  163.437393] bbswitch: disabling discrete graphics
[  163.437408] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20150930/nsarguments-95)
[  163.452106] pci 0000:01:00.0: Refused to change power state, currently in D0
[  165.457270] bbswitch: enabling discrete graphics
[  166.007073] [drm] Initialized nvidia-drm 0.0.0 20150116 for 0000:01:00.0 on minor 1
[  166.007077] NVRM: loading NVIDIA UNIX x86_64 Kernel Module  352.79  Wed Jan 13 16:17:53 PST 2016
root@DEFNOTKALI:~# echo $PATH
root@DEFNOTKALI:~# cat /etc/bumblebee/bumblebee.conf 
# Configuration file for Bumblebee. Values should **not** be put between quotes

## Server options. Any change made in this section will need a server restart
# to take effect.
# The secondary Xorg server DISPLAY number
# Should the unused Xorg server be kept running? Set this to true if waiting
# for X to be ready is too long and don't need power management at all.
# The name of the Bumbleblee server group name (GID name)
# Card power state at exit. Set to false if the card shoud be ON when Bumblebee
# server exits.
# The default behavior of '-f' option on optirun. If set to "true", '-f' will
# be ignored.
# The Driver used by Bumblebee server. If this value is not set (or empty),
# auto-detection is performed. The available drivers are nvidia and nouveau
# (See also the driver-specific sections below)
# Directory with a dummy config file to pass as a -configdir to secondary X

## Client options. Will take effect on the next optirun executed.
# Acceleration/ rendering bridge, possible values are auto, virtualgl and
# primus.
# The method used for VirtualGL to transport frames between X servers.
# Possible values are proxy, jpeg, rgb, xv and yuv.
# List of paths which are searched for the primus libGL.so.1 when using
# the primus bridge
# Should the program run under optirun even if Bumblebee server or nvidia card
# is not available?

# Driver-specific settings are grouped under [driver-NAME]. The sections are
# parsed if the Driver setting in [bumblebeed] is set to NAME (or if auto-
# detection resolves to NAME).
# PMMethod: method to use for saving power by disabling the nvidia card, valid
# values are: auto - automatically detect which PM method to use
#         bbswitch - new in BB 3, recommended if available
#       switcheroo - vga_switcheroo method, use at your own risk
#             none - disable PM completely
# https://github.com/Bumblebee-Project/Bumblebee/wiki/Comparison-of-PM-methods

## Section with nvidia driver specific options, only parsed if Driver=nvidia
# Module name to load, defaults to Driver if empty or unset
# colon-separated path to the nvidia libraries
# comma-separated path of the directory containing nvidia_drv.so and the
# default Xorg modules path

## Section with nouveau driver specific options, only parsed if Driver=nouveau
root@DEFNOTKALI:~# cat /etc/bumblebee/xorg.conf.nvidia 
Section "ServerLayout"
    Identifier  "Layout0"
    Option      "AutoAddDevices" "false"
    Option      "AutoAddGPU" "false"

Section "Device"
    Identifier  "DiscreteNvidia"
    Driver      "nvidia"
    VendorName  "NVIDIA Corporation"
    BusID       "PCI:01:00:0"

#   If the X server does not automatically detect your VGA device,
#   you can manually set it here.
#   To get the BusID prop, run `lspci | egrep 'VGA|3D'` and input the data
#   as you see in the commented example.
#   This Setting may be needed in some platforms with more than one
#   nvidia card, which may confuse the proprietary driver (e.g.,
#   trying to take ownership of the wrong device). Also needed on Ubuntu 13.04.
#   BusID "PCI:01:00:0"

#   Setting ProbeAllGpus to false prevents the new proprietary driver
#   instance spawned to try to control the integrated graphics card,
#   which is already being managed outside bumblebee.
#   This option doesn't hurt and it is required on platforms running
#   more than one nvidia graphics card with the proprietary driver.
#   (E.g. Macbook Pro pre-2010 with nVidia 9400M + 9600M GT).
#   If this option is not set, the new Xorg may blacken the screen and
#   render it unusable (unless you have some way to run killall Xorg).
    Option "ProbeAllGpus" "false"

    Option "NoLogo" "true"
    Option "UseEDID" "false"
    Option "UseDisplayDevice" "none"
root@DEFNOTKALI:~# service bumblebeed restart
root@DEFNOTKALI:~# modinfo nvidia
modinfo: ERROR: Module nvidia not found.
root@DEFNOTKALI:~# find 2> /dev/null / -name nvidia*.ko