I spilled coffee on my MacBook 2009 keyboard; after drying out, the column of characters 9,O,L,. didn't work, and lots of keys were sticky. I took it to the Apple store, and they said that they had a flat rate $750 fee to fix any liquid spill problems. To which I said: $150 @ ifixit.
It went exactly as the guide suggested; total repair time was ~ 5 hours.
1. Keep all screws and parts organized; I used little ziplock bags for screws and anti-static bags for electronics.
2. Although it doesn't mention this anywhere in the guide or video, you need to move the little square bumpers on the side of the HDD opposite the clamp from the old case to the new case, or it'll rattle around.
3. The video and the guide remove things in a different order. I don't think it matters, but I followed the guide.
4. Be very careful and don't strip any screws. But if you do strip one or two screws (such as the tiny philips on the battery), it's mostly no big deal.