for my 2007 frontier,u fist remove c-clip on window crank,i used a small flat head screwdriver,u don't have to be gentle,be carefull it dose'nt fly away,next their are three screw's to romove,two are under the arm rest,pop the soft cusion off,i used the same screwdriver,the last screw is behind the door latch (handle that open door) pop off the plastic,then remove screw,use flathead screwdriver to start to remove door panel from the bottom up. when u put the c-clip back on,it's easy'er to put it have way on and then isert the crank on the shaft.
r.kelly, February 2010