Nexus 5: Safe to update to Lollipop if on rooted + TWRP Android 4.4.4? I have a Nexus 5. It has TWRP as the custom recovery and on official Android 4.4.4 KTU84P build.

I just received a notification that I'm able to update to Android 5.0 now via OTA. I'm aware that I'll have to re-root my device. But, is it safe to update it with its current state? I already did a Nandroid backup hours ago, BTW. What else needs to be done pre and post-update? Thanks.

UPDATE: I backed up all my files then did another Nandroid back up. I downloaded the update via OTA and was asked to restart my phone. But it went straight to TWRP, doing nothing.

So I restarted my system via TWRP. It's still on 4.4.4 and the Lollipop update does not show anymore. What happened there?
The answer is the update won't push through if you have a custom recovery like TWRP. I had to restore the stock recovery using the Nexus Root Toolkit. Then the update showed again, and it went through flawlessly. Even the re-rooting part (again using NRT) was perfect.