My husband installed this fence easily. Our dog learned quickly where the boundaries are and we have no issues letting him outside now. We were able to get rid of the flags after only a month, probably could have done it sooner, but we wanted to make sure he knew his boundary. Our dog was still a puppy, about 7-8 months old when we started training him. He learned really fast and we didn't have any problems training him. The instruction booklet that comes with the fence gave some great information on how to properly train your dog.