well, in my case, having taught rocketry in our school district (K-12) for many years, they kinda turn all things rocketry over to me anyway... *S*
You are correct though, about my only involvement will be to make sure they get all the paperwork in on time, keep them on track and make sure they are clear on the goal and the safety code. Other than that, just sit and watch.
As for how hard it is? Depends... If you had just ONE shot at hitting 1500 feet, it would be very hard (just as it would be very hard to land on the moon with only ONE shot - instead, we started heading for the moon with the Gemini program and concluded with Apollo 11)
Testing will be as important as design and will help a school hit the 2-3% mark in actual competition. It is going to be an interesting event though. Comparatively, it is EASY to make a rocket to go the HIGHEST or stay up the LONGEST, but hitting a specific altitude with a specific payload, that ain't so easy *S*