My recommendation is get the new unit from Bullet-Proof and never worry about doing it again. BPD has redesigned the power supply and heat sink, hands down the best of the options on the market to solve this issue.
They have a great PDF on the installation on their website, what they ship is the power supply board and heat sink, you install it to your current bottom haft and logic board (retains all your current programming). Pretty simple, even for those who don't work on electronics much. Just make sure you take your time, and don't brake any of the plugs, or bend a pin.
NOTE: Upon reading Dave's post, I forgot to mention that BPD doesn't replace the older 7 pin connections.
Last edited by colo_dually; 08-11-2012 at 07:18 PM.