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.
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.