Start by removing the door trim panel to take off the outside mirrors on the Frontier and Xterra. Take off the electrical connector for your power mirrors before starting. First, take off the bolts holding the mirror, and pull it away from the door. Pull the inside mirror out by unscrewing the base of the mounting bracket with a screwdriver. The retaining spring will release when you lift upward, allowing you to slide the mirror right off. Reinstallation is the reverse of removal. You can put your mirror back over the windshield using a special mirror glue kit you find at auto parts shops. Before putting on glue, carefully wipe off the glass and base support, and follow the directions on the glue bottle to let it set for 24 hours.