Unless you pry at the right insertion points, you might have a difficult time removing the midframe. This shot of the display assembly, with display glass facing down, is meant to help you locate them.

The first insertion point is a divot to the left of the micro-USB port.

The second insertion point is a divot to the right of the micro-USB port near the corner of the phone.

The final insertion point is located about two inches to the right of the volume control toggle, toward the corner of the phone. An additional insertion point is located slightly to the right of the volume button if you need it.