i would advise you to pull out the mirror by pressing one side into which you cant push anymore, on the other side which the edge of the mirror is sticking out, Pull it which would easily come out.
Now you will see the motor and etc, the important part is to pay attention to the clips that are holding the mirror cap in place, the Big ones are the major which you get pass those, the others will follow.
i Did this to my F25 (AW), because i wanted to paint my mirror caps black
Good Luck~