I was VERY nervous about going this route and making the purchase but honestly with 3 open acres and not having to worry about our pup going down to the lake where we sometimes have Gators & Rattlers put me at ease. I would say the hardest part was for my husband digging the trench around the property line. We followed instructions and took the time to train her as book suggests. She learned very quickly and actually he become a much better listener when we call her to come.