Well now that I have your attention...the boot.img for Lollipop has been out for a few weeks now thanks to discipuloosho, franciscoFranco and binkybear efforts (my apologies for crediting or not crediting people).

It has to be done in fastboot and the last time I tried this I soft-bricked my Nexus. Can someone walk me through how to upgrade to Lollipop and still have a working Nethunter?