Hi Jclarckfork, what I did was tape the mirror completely with duct tape to prevent the glass shards from falling everywhere, then I used a 10 inch drywall knife and worked the glass from one end pulling outward carefully while scraping the adhesive off the wall from behind(the glass will break but the tape holds it in one chunk) I found the adhesive fairly sticky and there was also 3 strips of two sided tape holding it on... the scraper got most of it off though.I went a step further and removed the paper from the luan board to get better adhesion to the wall, only because the paper was quite torn after the mirror came off. I used pre mixed acrylic wall adhesive and glass mosaic tiles from home depot, and finnished with unsanded grout in kitchen, the bathroom is tumbled travertine with same grout. The berrys as well as vegas dan and others have done this as well, they have threads such as "tradewinds renovations" you can also search "tile backsplash" and find examples as well. The whole project including the bathroom tiles cost $160.00. Good luck with your project... and your tires! P.S. post more pics when u are done!
2000 National Tropical