I have an incredible running sock 2.2
I have radio version 2.15.00.07.28
I rooted my phone with unrevoked
I installed rom manager and clockwork recovery
I used rom manager to take a backup of the current rom to the SDcard
I used rom manager to download CM7
Now can I just go into rom manager and pick install rom from SD card and browse to the CM7 download? Should I check "Wipe Data and Cache" when installing CM7? Do I need to do anything special to make sure the GPS works once CM7 is installed?
If I decide I don't like CM7 can I boot into recovery and apply the clockwork backup and my phone will be in the exact same state as before the backup? Apps and everything?
Yes you need to wipe both your data and cache before installing CM7 or any other custom ROM. If you want to save your apps you can do so using Titanium Bakup. And if you decide you don't like CM7 all you have to do is restore your nandroid backup and your phone will be exactly the way it was before, apps and all.