Autism from a mama who has been there. I am going to try to post every day this month. Please feel free to ask questions in the comments.
Sabbath worship. Anyone with kids knows it is a challenge. Add a special need/disability to the mix, and you wonder, is it worth it? YES! I learned a lot from reading about Temple Grandin. Her mother forced, yes forced, her to learn how to behave in society, and if you want your child to grow, you will too.
Sitting still, being quiet (if you haven't reached reverence yet that is okay), and staying dressed. Rewards go along way. Quiet entertainment that is reserved for Sunday makes it a special treat.
Handing your child the Sacrament, when they are young, prevents disaster.
Talk to your child's teachers, give them tips, and educate them on your child's triggers. Ask the teachers to avoid perfumes/colognes and dangly, shiny jewelry in class. If possible, have your child meet the teachers and explore the room before Sunday. Be prepared to attend class with your child, but resist the urge to teach. You are the parent, but in this case, you are also a student.
And as with all children, you will need to adjust as your child develops and matures.
Wrap-around sunglasses and earplugs ARE appropriate if your child needs them. You can help the teachers in how best to explain this to the rest of the class.
Zipper ties and loafers are sanity savers in the early years.
Celebrate the small stuff. Be flexible. Laugh.