I watched Brandon Jacoby giving lessons of the dart stroke at their booth to a couple of guys a couple weeks back, and not only did he make the dart stroke look effortless, but explained how to practice it and how and why to do what was needed with it.
To be honest, I have only tried to jump a ball a couple times in practice before watching that, but after watching him give a demonstration to a couple other people, and how easy he made it look, I got out my Jacoby jumper when I came home and gave it a try. From lack of a success before to a moderate success almost immediately was really satisfying. He gave such clear and easy to understand instructions, that even a hack like me can mostly do it.
To be honest, I have only tried to jump a ball a couple times in practice before watching that, but after watching him give a demonstration to a couple other people, and how easy he made it look, I got out my Jacoby jumper when I came home and gave it a try. From lack of a success before to a moderate success almost immediately was really satisfying. He gave such clear and easy to understand instructions, that even a hack like me can mostly do it.