I've done this - getting the plastic off was difficult, and I did break one of the retaining tabs despite reading the warnings. BE VERY CLEAR THAT THE RETAINING CLIPS ARE AT THE THIN END OF THE TRACKPAD THAT WILL BE NEAREST YOUR BODY WHEN USING IT - that is a lot clearer than "opposite the battery compartment". Anyway, I managed to get the thing apart without completely breaking it. The rubber feet have come unstuck, which is a bit annoying - everything else is glued so securely. Without the feet attached, my random click issue seemed to have gone away - however, you need the feet and the click to do certain operations such as dragging to select for a screen grab. Back to the drawing board.
Fix the darn picture since bottom and top are competely relative to your perspective, and it sounds like the picture is just showing you how to break your trackpad!