C'MON MAN!!?!?!? REALLY?
There is NO heat man, the "heat" we are referring to is the "heat" you are catching right now.
There is a STEP BY STEP DIY for this in the "DIY" section at the top of the GEN 5 & 6 section. Just click on your browser's "back" button and you will see it. Made by me. Tons of pictures that took a while to scan.
In fact, there is a DIY section for 93.9% of the mods you will want to try also in the "DIY" section....you should check it out sometime. A sh*t load of hard work, pictures and info can be found there.