My rear passenger window is jammed and I want to get the panel off to have a look.I think I understand how to take the window winder off. How easy is it to take the interior door handle off? Does it just unscrew, leaving just the lever still attached to the door. Does anyone know what could be causing the jam. My daughter was winding the window down when it became stiff, turning the handle did not move the window. I had to pull the window up then turned the handle and that has closed it, but I want to get it working again.