No need to remove glass. Window is held to mechanism by 2 clamps. Find these and loosen bolts, put piece of card over top of glass and force it into top rubber to hold out of the way. Fix with a bit of tape for safety. Then the mechanism is bolted to door (behind door panel). Loosen/remove these bolts and remove power plug from motor. The motor and mech can then be juggled out through a hole in the door. Need to remove plastic sheet to suit. Fit cables as old ones and refit. I know it sounds simple, but not too bad, just be prepared to lose an odd knuckle! Good luck.