Hi! I have an 8yo DD with AS. One invaluable tool we use are earplugs! My daughter too has issues with noise and anxiety, and she can do just about anything at WDW with earplugs! DD is not prone to tantrums, so we are fortunate with that. We actually go with her flow during the trip. We go a lot, so we can spend hours at Animal Kingdom in the "dinosaur dig area" because she loves the way the little rocks they use for sand feels. My best advice: Earplugs and take it slow!