tobeychris thanks a lot for this tutorial! I am diving in now to make my first step at doing this alone, without wideawakes help. I will of course let you know when I have accomplished my "official" first unlocking and flashing (all by myself)!
also a big thanks to cmonex, no2chem and ghettofreeryder for working so hard to make this so simple!
Edited 2/21
It's official I HAVE NOW!
unlocked and flashed my phone to Mightys Windows 6.5 ROM for the HTC Diamond. I am so excited and can't wait to see what I learn next