This is a diagram of the ribbon clamp connectors you will disconnect in the next step.

1) With your fingernails, grasp the locking bar on either side and pull up a small amount (about 1/16" or 2 mm).

2) After disengaging the locking bar, slide the cable out of the connector.

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

Slide the orange trackpad ribbon out of the connector.

Use a straightened paperclip to open the optical drive tray, and pull it out about halfway.