[masraum]

look at the bottom of the mirror housing, there should be a small hole in the bottom middle. I adjusted my mirror to point up and in so I could see behind it a little better. There's a ring that needs to be turned about 1/8th turn to disengage the mirror.

I used a small regular screwdriver, actually, I think I used one of the screwdrivers from the tool kit in the car.

Which direction, can't remember for sure.

I can tell you that it was a bit of a pain in the butt. I think it took me 15-20 minutes to get the old one out, but the new one went in in about 1-2 min.