For 2003 and earlier models, lower the window completely and carefully pry off the mirror trim cover using a small screwdriver or trim removal tool. Remove the 
Door Trim Panel, disconnect the mirror electrical connector, and detach the harness clip. Then, remove the three mirror retaining nuts and detach the mirror from the door. Installation is the reverse of removal. For 2004 and later models, lower the window all the way and remove the door trim panel. Remove the front door molding by prying loose the two retainers at each lower end, then pop loose the six orange clips along the molding. Carefully disengage the molding from the hooks at the upper rear and lower front corners of the window opening. Disconnect the mirror electrical connector, remove the three mirror retaining nuts, and take off the mirror assembly. Installation is the reverse of removal.