Just do it and relax if you can. You'll know much better what it's all about after the first one.
In our club, you do not need to join the AMA. It used to be required but that was when we were using insurance through the AMA.
Walking the section is a learned skill. Briefly, I walk through the first time carefully finding the boundary markers and any split markers for my class. I then come back and walk it again as if I were riding it. At the end, I walk back toward the beginning about 20 or so feet and then turn and look at the exit and the line I want to ride, then I go back another 20 feet or so and look at that portion and how it ties into the end. I do this until I'm back at the start and then I look for any non-standard angles or things I might want to move for a better entrance. As long as it's outside the section markers, you can move anything but you might want to wait till the last minute so your competition doesn't see what you are up to :smirk: By the time I'm ready to ride the section, I've broken it down into linked portions and I've reviewed the parts that are not in front of me the most.
Then I review the basics in my head: feet away from the frame, legs open a little, hands relaxed, bend at the ankles and knees but keep the waist quiet, head up, open the legs for the turns and allow the bike to flow under me. And listen for "RIDER!!" (from the observer) and then remember RELAX again. :thumbsup: