I received this lock earlier this week and we finally got time to install it. Let me say super easy to install, took about 15 minutes. In saying that It was put on an already existing front door, so the holes for the latch and handle were already there. The directions were simple and Easy to understand. Programming it was super Simple to. I like how you can program several codes so if you had workmen or a housekeeper coming they have a separate code that can be deleted easily.