I recently purchased 2 of these SmartCode locks and installed one on my front door and one on a side door into the garage. The installation was pretty simple and straightforward on the door that previously had a dead bolt. The other door required preparation as it had not had a deadbolt. That was pretty simple also because I had the necessary tools and templates to prepare the door. The programming and rekeying of the locks was fairly simple, however, I cannot over emphasize the importance of following the instructions EXACTLY I enjoy the convenience of being able to lock and unlock the doors without a key. I highly recommend these locks..