Having just done this - successfully, I might add - I need to make this guide a little more clear:
Step 1: open the case. See every other tear down for the screw count.
Step 1A: remove the battery connection.
Step 2/3: remove the fan as instructed.
Step 3A: remove the optical drive. See the relevant tear down guide for specifics.
Step 3B: remove all of the connecters to the logic board: keyboard, backlight, trackpad, fan, speaker/subwoofer, battery status indicator, hard drive, optical drive, camera, display. See the logic board removal guide for more info.
Step 3C: remove the screws holding the DC-in board and the logic board. Remove the logic board.
The remaining steps are pretty OK. Buy a new backlight and diffuser panel along with your new KB.