I was the guinea pig for my ball driller when we decided to try the Vise ITs. We both reviewed the instructions to make sure we understood everything, then he drilled my first ball with it. The first ball was a little touchy just because we needed to figure out how to set the drill press so we could repeat the process. However, once we figured it out, it's actually very easy to install the Vise ITs. It only takes a couple minutes to do. My ball driller would rather install one of these than the Turbo Switch Grips since the process involves several steps, but the steps are simple and pretty easy to repeat, so every ball ends up absolutely identical. (It's also easier than trying to oval out and bevel a standard thumb slug!!!)