The screws, man, the screws! Like Dilbert said, keep track of those screws. There's so many damn types of screws in all their lovely shapes and sizes that if you forget which ones go where you'll end up never getting the laptop back together.
I'm used to building a desktop where you have two, many three types of screws -- and they're all pretty easy to tell apart and even interchangeable. The one laptop I tried to work on.. definitely more than three.
