Turn the laptop upside-down and remove the following screws using a Phillips #0 driver:

Two 9.5 mm screws in the middle of the back edge, and one 9.5 mm screw in the right edge

Two 4.3 mm screws in the back corners

One 17.5 mm screw at the left edge near the optical drive

Three 4.3 mm screws in the front edge