I left my laptop open (because I was downloading a torrent) on the floor beside my bed before I went out to the clubs and had a bit to much to drink. I opened my eyes up the next morning with my head hanging off the side of the bed and saw puke right on the keyboard. Cleaned it all up, picked the gunk out of the keys and the only buttons that had a hard time were the U and return keys.
Repair went really well, about 1hr to take it all apart and 30mins to put it together.
I had no issues, just remember where each screw goes and have the right tools at hand will make the job quick and painless.
P5 Pentalobe Screwdriver Retina MacBook Pro and Air
MacBook Air 13" (Mid 2011) Upper Case with Keyboard