Manuals for PowerBooks always want you to take the whole display off. Thats a real pain on the 12". And unnecessary on all of them. If you are careful, you can undo the two hex screws in the bottom corners of the display, and open the display up and swap the panels without having to undo the bottom half.
You want a paint scraper or something to open the display. The plastic purpose-made tools that Apple provides are utterly useless.