This is a diagram of the trackpad ribbon clamp connector 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.

Before you can yank the upper case off with joy, you must disconnect both the blue and white power cable and red and black speaker cable as described in the next steps.

Lift the upper case from the left side and use your other hand to pull out the right side in order to clear the power receptacle.

There may be a thin metal bar fastened to the upper case by the two screws on either side of the optical drive. This bar provides rigidity around the optical drive; don't forget it when reassembling.