As I have done a good amount of laptop dissassembly and reassembly I can help you a little here with a few tricks.
First, one tip is DIXIE cups. THose little drinking cups if you are outside the US. As you remove screws put them in labeled dixie cups based on where they came from. So say, Keyboard, EMI Shield, Base, Display, Modem and so on. Then order the cups in the order you removed the screws so that they can help you remember how to put it back together.
Next, for soldering, make sure you have a good high heat soldering iron. Multilayer boards often have a ground layer that is almost solid copper. This means there is a piece of metal the size of your board. You need a good wattage soldering iron (35W or higher). The reason being, it is better to have really hot for a short amount of time versus having to let it build up to that temperature.
Oh yeah one more thing. If something doesn't work after you have put the device back together, take the thing back apart as far as you had previously and put it back together. Just today I was working on my wife's laptop and the keyboard refused to work. Took out the keyboard and replaced it like 20 times, no lock. So I said screw it and took it all the way apart, noticed I forgot to reconnect a fan cable (no at all related to the keyboard) put it back together, everything works fine. Go figure.
Edited by PedroDaGR8, 27 February 2009 - 05:58 PM.