It does indeed sound like a failing motor; as the motor gets worn, or the mechanism starts to bind up from wear, teh curent draw on the circuit increases. When it becomes too high, it will trip the circuit breaker that protects the wiring in the car; after the breaker cools and resets it will work for a while untill it happens again.
Yes, you can install this yourself if you are mechanically inclined, although it really is not much fun. Working inside doors involves lots of sharp edges and working by feel.
Remove the door panel; unbolt the window glass from the regulator, slide it up and tape it in place with some Duct tape. then, unbolt the window regulator, unplug the wiring from the motor, and remove it through the opening in the door. No special tools are required; unless it is a mechanism that is riveted to teh door (some are); in which case you will need an electric drill to drill off the rivet heads for removal. If you do not have a rivet tool to reinstall it, bolts and nuts can be used.
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