Put this on my garage door and it was a vey easy swap out to my old knob. Hardest part was tucking one of the wires from the 9-volt battery, but that was just me being overly picky. I will say if your cover plate doesn't fit right on the plastic interior piece turn to door lock back and forth and it'll click right in. It's got to fit into the turning mechanism inside the plastics interior piece. Once did that it was done