Removal
This is a very easy job - the
mirror is held on with a set screw. Using a T10 (torx)
screwdriver, loosen the set screw, and the mirror will slide
right off the metal plate that is glued to the windshield.
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Installation
Just slide the base of the
mirror onto the metal plate glued to the windshield, and
tighten the set screw with a T10 (torx) screwdriver.
If your metal plate has fallen off the windshield, auto
parts stores sell "repair kits" with the glue you'll need to
reattach it.