1) Make sure you TP2 is at least 50% battery
2)
Unlock your device
3)
Download and unzip(if zipped) ROM of your liking(make sure you unlocked you device prior - very crucial)
4) Connect TP2 to PC with (extended or regular)mini-usb to USB cord
5) Make sure it says "connected"(does not have to by synced just connected) in either
ActiveSync(WinXP or prior) or WMDC (Vista/7)
6) Double click on ROMUpdateUtility.exe(could be called something else but its exe file in folder of your new ROM on pc)
7) Click next about gazillion times, and wait about 2 mins(it says 10 but its much faster)- DO NOT DISCONNECT TP2 FROM PC DURING UPDATE!!!
After PC screen says done(not before that!!!) you can disconect TP2 and follow set up instructions after it resets