Before proceeding, unplug and power down your MacBook. Close the display and flip it upside-down.

Remove the following eight screws securing the lower case:

Two 1.8 mm P5 Pentalobe screws

Four 2.9 mm P5 Pentalobe screws

Two 6.1 mm P5 Pentalobe screws

Note the orientation of the screws as you remove them—they need to be reinstalled at a slight angle.

Throughout this repair, keep track of each screw and make sure it goes back exactly where it came from to avoid damaging your device.