Well did you engine completely die or is it struggling? Either way you will have to take the door panel off, get in there and you will see the rail system which the window uses for going up n down. You need to unscrew the glass and take it out. Then you will need to take the whole rail system including the motor out and get a new one. The installation is pretty simple as well. You just need to remember in which position the motor was in as well as the rail system, which shouldn’t be a problem. Screw the glass in and put the door panel back on.