First thing to know, if you screw up ANYTHING, your phone will not boot. Never again. Complete brick.
-
Familiarize yourself with the Verizon Upgrade tool. It’s what allows you to get to fastboot in the first place

-
Downloading their update take forever. Learn how to create a python http server. Have to figure out the root structure of their server to spoof it. Don’t have to do this but it saves a lot of time.
-
Figure out a quick command to kill the tool when you reach fastboot.
That’s all for now.