My oldest son is about the handiest guy I know. He'll walk in the house on a visit and one of the first things he says after, "Hi Mama, Love you" is "what kind of work do you have for me to do around here?" I always have a list for him... ;) The one exception is if it's a short visit. He lives out of state, so if he's not going to be here long, then I refuse to let him do anything (I like to spend all the time I can with him if he's just popping in and popping out). If I had a pet, installing a pet door would definitely be something I would want to consider, and my son would be the one I would recruit to do it, because I know he'd do it right. I bet he'd be glad to do it too, and the instructions below would be just the ones we would use.
If you're considering a pet door, and want to do-it-yourself, then this is the infographic for you! If you use it, I'd love to hear how it worked out!