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Put painters tape on the entire mirror. If it breaks, the tape will
keep glass from getting everywhere. And painters tape comes off
leaving nothing behind.

After taping you have to use a putty knife, pushing it in gently between the
wall and the mirror edge and then slightly twist the putty knife. You do
they around the perimeter of the mirror and at one point the mirror will
pull away from the wall. I just finished do a 50 by 30 in my bathroom and
the only casualty is the sheetrock behind the mirror where the adhesive was.