Loosen the trackpad clamp by pulling the top piece up slightly, freeing the trackpad ribbon.

Slide the orange trackpad ribbon out of the clamp.

Do not lift the upper case too far without first disconnecting the audio cable.

Push out the rim of the lower case and pull up on the upper case, grasping it just to the left of the optical drive.

Repeat the above step on the upper left corner of the upper case, grasping the bottom left corner of the upper case.

Disconnect the audio cable.