You will have a blast. I'm in ACTHA and we set up 12 trail obstacles in my arena, round pen, and back yard this past weekend to get back into mental shape for the upcoming trail challenge in a couple of weeks. (I broke my arm this summer and am just now back in the saddle, trying to get back in condition!). You can see how your horse does on 6-7 mile trail rides in your area, and if she does okay, you'll be fine. The challenge allows you to take the trail at your own pace, and the people who compete (at least here in my area) are GREAT about giving you tips to help you do well. You get a score for the rider and a score for the horse.... Really fun. I ride gaited and you just tell them at the 'trot' obstacles that you're riding a gaited horse and they score you accordingly at the alternate gait.