I've had several windows stop working over the years and usually, if I can't hear the motor when I push the switch, it's usually the problem. If I can hear the motor, I assume the relay.
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== Update ==
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My son in law is a mechanic so we just went to the wreckers and found a replacement motor for my window and he installed it. If I didn't have him to work on it, I'm sure I would have taken it to a professional. Only you know how mechanically inclined you are ;) Best of luck!!
I've had several windows stop working over the years and usually, if I can't hear the motor when I push the switch, it's usually the problem. If I can hear the motor, I assume the relay.