In Eastern Oregon we have quite a bit of 3d shoots. I like to make it to as many as I can, like nharold said, its a good way way to practice and be have fun and competitive. You really need to be good at judging distances, down hill, up hill shots, shooting moving targets, and being able to shoot kneeling. 3d shoots are alot of fun!!! be sure to bring the family or even friends along. The best part alot of them consist of shooting two days if you want to be competitive or only shooting one day if you want to shoot for fun its your choice. Depends on the shoot you go to they may have door prizes, games, and much more. Alot of them also have a practice range so you can stretch out before you start the courses.
Hope I helped and good luck!! you really should try a couple they are alot of fun!!!