For reference, the backside of the screen is shown in this step.

Note the narrow clearance between the edge of the screen and the OLED panel under the glass. If you plan to re-use your screen, be sure to follow the instructions below closely.

Also note the two different seams between the body of the phone and the screen:

The screen seam: where the screen meets the rest of the phone. This is where the screen will separate, and where you should pry.

The midframe seam: where the midframe meets the body of the phone. This part is held down by screws. Do not pry at this seam.