It's probably not as difficult for some of the programs that have a majority of players that have been playing at a higher level of soccer for years, but I believe the vast majority of high school programs have many players at both ends of the spectrum.

If you have boys that have been playing Academy, Premier League, etc.; but at the same time half your team has been playing recreational soccer (or not at all in the off-high-school-season) where do you even start? If half your players have trouble trapping the ball, making simple push passes, etc., how can you run semi-complicated drills?

I bet good money that if you handed out questionnaires to high school teams around the state, the vast majority of players would not have a clue what terms like dynamic movement, keeping your shape, making a run without the ball, etc., mean.