Flip the top of the mouse over so it is in the orientation it would be during normal use. Turn the top of the mouse so the main buttons and wheel are facing you.

Insert a plastic spudger into the seam in the grippy facade at the front of the mouse, nearest the right side of the buttons. It should snap out of place.

Apply pressure to the bottom edge of the facade under the middle of the mouse buttons. It should snap further out of place.

Flip the top of the mouse over so the main buttons and mouse wheel are facing the work surface.

Insert a plastic spudger into the seam between the grippy facade and the plastic base of the mouse at its right side. The facade should almost completely snap out of place.