Can someone point me to, or tell me step by step how to install NVIDIA drivers on my laptop?

I have a Satellite P850 with a Intel HD4000 and Geforce GT 630M, and would like to use the hashcat and Piryt with that Geforce. Simple really.

I've been combing the web for a solution, but things are not clear. At all.

Should I install the drivers first and then bumblebee?

Completely lost here.