heres the instructions straight from the ford repair manual.
Remove the 3 nuts and the exterior rear view mirror
To install, reverse the removal procedure
i hope this will help you out.
Remove the exterior mirror cover.
Remove the interior door handle cup cover
Remove the interior door handle.
Lift the front of the window regulator switch plate from the front door trim panel and remove the window regulator switch plate.
Disconnect the electrical connectors and remove the front door trim panel.