MacBook Unibody Model A1278 Upper Case Replacement
On steps 50 and 53, be VERY careful to stop tightening the small, weak Y0 screws when you meet even just a little resistance. I made the mistake of tightening them too hard, and broke the tops off of two of them! Luckily I was able to remove one of the screws, but now one of them is stuck in one of the trackpad holes, unable to be removed.
MacBook Unibody Model A1278 Display Assembly Replacement
Be EXTREMELY careful when removing and re-inserting the 'camera' cable. The contacts can be easily bent beyond repair if you try to force it back in. Damaging this cable at this connection or near the display may disable your ability to use your iSight camera, AND both your Bluetooth and WiFi. I had to pay apple $300 to replace the entire display assembly because one prong was faulty, causing my WiFi card to not be recognized.