I just repaired my mba after spilling some juice on it... I did it in about 2hours, i kept track of the screws in each step and i must say it wasn't difficult at all, and i have no experience with computer so.. Just be careful with some wires and when you disconnect the monitor but that's all. I'm so happy my mba works again! The upper case and the tools arrived very quick and with adhesives and some extra screws (much appreciated since the stock screws were kind of damaged and i had to break one) for the trackpad. Thanks ifixit!