Default droid 4

Hello,
I would like to flash my vz droid4 to page plus. There is a video on how to do it here:
youtube.com/watch?v=bhnXM9zY5_U
however, I am a total newbie and to know about computers, but I know nothing about programming, etc. I am scared that I would do something wrong and mess up the phone. Can I restore the phone back if I do mess it up?
There is a guy on eBay who will do it for $30, but honestly, I would like to spend around $20.
How do I root this phone so I can install the newest version of android?
I am very disabled and have a limited income. The main reason I was a is because of my limited fine motor movements. Can you guys help me and tell me if I can:
flash it back to Verizon
how to back it up and restore if I mess it up.
If the above instructions work on the droid 4 (if someone could post newbie text instructions it would be appreciated)
thank you!