Okay, well, that wasn't too bad besides the considerable expense.
First step was to pull the window controls. Easy enough to pry up with a plastic tool. Also pull the screw under the tab in the door pull.
Next pop off the little cover behind the door handle and yank the one screw.
Then, using the appropriate plastic pry tool pop all of the plastic rivets out around the door. Pull the door opener and move the door card free.
Pop the rivets holding the tweeter on and you'll find the three nuts in question.
Beneath the mirror (under the door card) you'll find the two connectors for the mirror.
Pop the old mirror off (it's super easy) and attach the new one. Installation of the card is the reverse of the removal. It takes a bit of fiddling, but nothing too bad. I only broke one of those damned plastic rivets.
I am now the proud owner of a full set of summit mirror replacement parts (glass, motors, lights, sensors, etc) if anyone needs them.