iFixit

Remove all screws from the case.

Some screws are under rubber feet, or small, square paper screw covers (red square). I used a sharp metal tool to get under the screw covers. You could use an X-acto knife.

Several case screws require a Tri-Wing screwdriver.

The next step has more pictures of removing rubber feet and the screws underneath. The feet and screwcovers are self-adhesive, but not every foot or screwcover has a screw.