If you wan't my advice just send it to HTC, or any oficial repair store.
I've tried to change that same part on the diamond and everthing was fine till i discover that the screen it's glued to the digitizer and you can´t separet then whithout breaking the screen.
Then you just have to go and buy another screen, that's the expensive part
Send it to an oficial store, keep the waranty.It's about the same price you pay for only the screen.
Sorry my bad english.Out of practice...
- Android - Gingerbread