The LCD is glued to the metal LCD shield plate behind it along the top, left, and right edges. In order to safely loosen this adhesive, you'll be using a guitar pick to shift the LCD a couple of millimeters left and right several times.

Insert a guitar pick into the gap between the LCD and rear case, near the top of the left side of the LCD.

Bend the pick slightly away from the iPad, just enough to spread the gap between the LCD and rear case.