1. Pry with a screwdriver..
2.... and remove the triangular trim by removing the two pistons of its fastening from the door holes.
3. While holding the mirror with your hand, remove the three screws securing it.
4. Remove the mirror..
5.... and disconnect the heater wiring harness block..
6.... and mirror adjustments.
Note. This is what the outside rear view mirror looks like removed from the car.
7. Install the outside rear-view mirror in the reverse order of removal, adjusting its position using the oval holes in the door.