I found you can skip steps 36-39. Just unscrew the volume button bracket as shown in step 40 and rotate it away from the buttons, then the buttons can be removed with tweezers.

Great guide, I successfully swapped the LCDs of two PowerBooks (specifically a 5,2 and 5,6). I was unable to remove the antenna board in step 11, it wouldn't come out of its little crevice completely. So instead I simply peeled off the top part of the protective tape and unplugged the antenna cables. Works just as well!