So if you were able to extend it, now u can remove I believe 4 small screws to remove the front plywood. Once that is folded back, there are more screws holding top plywood. Yes u have to be patient and a contortionist. I bought a 90 degree attachment for my mini drill to get them out. Now retract unit and remove 2-4 sheet metal screws holding complete unit in place. Oh! Unplug power!!! Mine came in from left side. As I pulled unit straight out, it maxed out to door frame before I could tilt up to remove unit. U can email me and I can help over the phone if need be.