Took apart a spare mirror I have laying around for you guys. It's pretty much self explanatory...but I'll help along the way of I can!
Tilt mirror in
Pop off..takes a little force. Pull out.
You can see how it attaches here. Just tension clips
There's two screws on the right of round plastic. Remove those. Already removed in this pic.
Here u can see the plastic clips you must release. Just lift up with a flat screwdriver
Remove this screw as well
More of the clips to.release
Cover off so you can see the clips
That's it...cover off!!
Just push new cover on and replace screws. Push glass back on and reinstall mirror if off. But mirror doesn't have to be removed to remove the cover.