This is tricky, and an extra pair of hands may help. Use the opening tool to pry the screen out from underneath the tabs holding it in place.

Once you have created some space between the screen and the cover, slide the opening tool under the screen.

Slide the opening tool around the outside of the screen, releasing the tabs as you go along.

Be careful not to pull too hard on the motherboard while doing this, as there are still many wires attached to the body of the device.