With the screws removed, we can remove the last clamshell that stands between us and the internals.

Where you are going to pry now has electronics underneath, try to keep your prying tools close to the edge. Check the second image to see where the sensitive electronics and cables can be.

Removing this shell should require significantly less force than the palmrest removed in step 2. Still, take your time and try to apply pressure from multiple points if possible.

Using a spudger or your prying tool of choice, apply press between the upper shell and the bottom part, there are two clips near the front of the mouse that prevent the upper shell from moving forward, so remove the shell in the direction of the green arrows.