1991 cadillac brougham window regulator
 

Looking for some guidance... My passenger front window goes up and down in small increments. Sometimes i have to wait a few minutes in between attempts to raise the glass. I was told to replace the window regulator so I just purchased the AC Delco #12497971 regulator. Has anyone run into this issue in the past. How difficult is it to replace? Ive tried to hold the window switch down or up while closing the door to possibly free the regulator (motor). any other tips or words of advice before i take my door panel apart? thank you!