re: How does one be a non-neurotic soccer dad?

As a high school coach, I'll add one more thing. Talk to the coach, no matter what level he's playing, and just discuss what the coach wants from your son. Don't go into trying to change the coach's mind, but use the chance to help unify the messages your son is hearing. One of the worst parts of being a coach is hearing parents yell things that are totally counterproductive to what we have set the team up to do. Having a unified message from dad and coach will help him avoid indecision.