Finished the practice kits today. Didn't turn out too bad. I learned a lot. Bucking rivets is definitely a learned task that should be very respected. Air pressure has to be turned down to around 45 psi for 3-3 rivets on a 3x gun. I dented a skin pretty bad using it at 90 psi. Also a tungsten bar is invaluable. Now I just have to convince the wife to practice holding the bar.