Using a plastic opening tool, carefully detach the five plastic clips securing the upper case.
There are two small LEDs in the top edge of the lower casing, near the bottom right of the laptop. Be careful not to damage them as you pry open the plastic clips.
Carefully lift the upper case and flip it towards the front of the laptop.
Carefully slide the hard drive away from its socket.
Use the attached pull tab to lift the hard drive up and out of the case.
When reinstalling the hard drive, be sure that the WiFi antenna cable (visible as a black loop below the disk in the 2nd photo) is not trapped or pinched beneath the drive.
Great tutorial, thanks, I wouldn't have managed to change the drive without it, I couldn't figure out how to remove the keyboard, those latches are tricky...