Window motor

Does anybody have specific intsruction for replacing a drivers door window motor? Basically, with the window going down, is perfect, yet with it going back up, it's slow. I can only assume the cause of this is the motor. The problem with the front pass door, is that when the window goes down, there is this clicking noise. My assumption is that it is due to either the window being off track and/or the window regulator is damaged. I really don't want to spend 400 a door to have someone do these jobs... Any suggestions and procedures for doing this?