Colour blending

My FMP needs colour blending and corrections to blend the CG with the real footage. I have been experimenting with people compositing. i found the best tutorials and the most support in the oddest place. Porn, on the internet people are constantly making fake images of naked celebrities which actually takes a lot of skill. I always disregarded "fakes" as just people messing about but when i started trying to blend my cg i realized how complex it is. i also found there are a lot of forums filled with people who make these fakes who are happy to talk to you about how its done and offer tips.