My brother spilled coffee on his wife's 13" MacBook Pro...two years ago! They've just let it sit because they thought it would be too expensive to repair.
SUPER easy. The guide was thorough and easy to follow. The only hitch was that after I replaced the logic board, I realized that 1. The battery was swelling, and 2. The DC board was fried as well. Both were shipped expediently, and when I swapped those out, everything booted up great!
1. Keep track of your screws. I take post-it notes, number them to the guides, and tape the screws to the post-it notes so that I can keep track of them.
2. Use the right tools. There's nothing that will substitute for the Tri-Point Y1 screwdriver to remove the batter. Believe me, I tried... ;)