Changing housing on iPhone 4

Hey all, I need to change the screen on my 4. I've brought LCD with digitiser, back and home button as I'm gonna change the whole thing. Now I've watched a few videos and I've messed with 3GS's b4 but first time doin a 4. Is there anythink I need to watch out for that u can't see on videos etc as I don't wanna f**k this up lol.

Thanks u.s