Is it the electric motor or the switch? This is the first thing to decide. If its the motor you have to pull the door panel off and take the old window motor out and replace it. Once you take the panel off you will see the motor and it will have rivets or bolts holding the motor on. This can be a pretty hard task for you if your don't have tools and knowledge of mechanics. I assume you mean the motor, if its the window you want to replace then the same applies except the window s on a track and comes out of it from the top.