Bonnie,
See if the trainers will work with you to use lower jump heights and it won't be like you are drilling him everyday. As Jim & Bethany said, there are a lot of obstacles you can do now, I think I passed along several of them in another thread from advice given on the Performance Corgis list by very experienced and conscientious agility competitors.
In a sense, you've already started some agility training, as basic obedience is the foundation for almost any dog sport.
You might want to do everything but the jumps. IF the class is as much fun for the both of you as it sounds like, then I think you could probably work something out.
Debbie