The first step of disassembling the mouse is to remove the outer shell and main top component of the mouse without damaging any parts.
Note that the circuit board has capacitors. Though they aren't very dangerous, you may wish to discharge them before handling the circuit board. A tool to accomplish this can be found here.
Flip the mouse over and peel off the stickers on the perimeter of the bottom of the mouse
Use the Phillips #1 screwdriver to unscrew the six round head screws on the bottom of the mouse. Those marked with squares are 9 mm in length, the rest are 5 mm in length.
Grab the top shell of the mouse and lift up to remove.
Touch your capacitor discharge tool to the capacitor leads on the board to release the stored energy. If leads are inaccessible, wait until you've removed the board from the mouse body.
To remove the white wire connector on the bottom board, use a spudger underneath the white plug and pop it out (this disconnects the upper board from the lower board).