So the housing and "skull" are damaged, but everything else seems fine. From this site, it looks like I can get the parts to fix it up for ~$45, but I'm having trouble finding good info on actually working on it. I'm used to the 96 Civic I had before this car that had endless and easily found/available maintenance and repair information and advice. Having trouble tracking down a good guide for taking apart the mirror and installing the new bits.