Remove the four screws (blue). The screws are identical and interchangeable, so you don't need to keep track of which screw went where.

Note that one screw is covered with a sticker. Don't miss this one or you may crack the circuit board.

Release the two locking clips (yellow). The clips are holding the board down on the corners and it cannot be released easily without pulling back on them.

The board only needs to be lifted enough to let the digitizer connector through, it does not need to be removed completely.

Take note of the speaker wires (red). They are soldered onto the board and special care should be taken to ensure they are not broken or otherwise disconnected.