These door knobs are great quality and have modernized one of the details of our home that was outdated with 20+ year old gold hardware. Installation is straightforward, the only thing you will need that you may not have considered is an L-shaped Phillips head screwdriver to tighten the mounting screws. The knob itself is wide enough that no straight screwdriver or drill, even very short ones, will fit. Tightening these screws takes longer than every other part of assembly/replacement put together. Not challenging, just time consuming and in need of the right tool for the job. We are very happy with them now that they are installed.