As far as I know you need to get some lard from the store and make sure to put it on about 2 inches larger than the area your heating. Don't heat the back of the bow to much or you will weaken it, just enough heat to get it hot to the touch, at least that's what I was told. Just heat the belly going back and forth until its a bit darker brown and heat the sides a bit along with the back. Just make sure you have enough lard to keep it from drying out to much. I was able to line up my nocks this way on my first bow and it worked out great. I used a 5 gallon bucket with a clamp on the bow to keep it from falling off and just added some bricks until it goes a bit further than you actually want it to be. It will spring back a bit after you bend it, so make sure you go a bit further than you need, I would say about 3/4 to 1/2 inch. I have only done this once, so you might want to wait until someone who has been doing it longer chimes in.