I'll let you know soon. I'm going to be doing the same thing this week.
I acquired a mirror from a junkyard, but it was the wrong color. I sanded it, primered it, and repainted with several coats of Krylon after masking off the black strip and the glass.
As the old mirror was ripped clean off the car I didn't have any trouble removing the old one.
There is an oblong triangular piece (called an applique
according to the local Pontiac house), and two nuts that hold it in from inside the door. The applique
and nuts were less than $10.
Looks pretty straightforward to me. Remove the door panel, slice the plastic sheet on the inside of the panel as little as you can, put the mirror and rubber gasket on from the outside, install the applique
with the two nuts that hold the mirror on, connect the plug and reinstall the door panel.
Nothing to it right?
The really tough part? Trying to put parts on it as fast as she
can knock 'em off!