1. Make sure you are wearing and ESD anti-static strap, or are in an anti-static environment before working on the inner parts of any electronic device.
2. There may be some electronics surrounding the upper keyboard screws (if it has any). Carefully lift it out if you can, but you may have to do this after you remove the screws that hold in the keyboard itself. Don't forget to replace them before you replace the keyboard.
3. It takes the right amount of pressure de-attach plastic parts from a laptop. Make sure you aren't warping the plastic when pulling up on anything, and make sure you have removed everything connected to it beforehand.
4. It's very difficult to work on laptops, and any damage done internally my void your warranty. Work on laptops with discretion, and if you have any reservations, consult a professional.