2003 Buick Rendezvous

What is your issue? Is the motor seized? It is not a difficult job, but you have to be carefull when removing the door panel as the type of retainer used can be stubborn, so you don't want to break the panel when you are removing it. It is common for the sash and guide to break which will prevent the operation of the window. Advice, take it apart and have a look.