I just do my 15 yo son who has severe sensory dysfunction and won’t let anyone else touch his head. It’s super stressful but it’s gotten lots better as he gets older. I can’t imagine doing 3 back to back. He definitely has to shower immediately, I think he could handle a salon at this point except for the fact of not being able to shower immediately. I only cut it about every two months. It looks shaggy as heck but we both avoid it as much as possible lol.
I think you need another adult present, that would help a lot. Do what you can to manage your own sensory issues, this seems to be a big point. Apron, have some dedicated junky clothing to wear for this task, try doing their hair dry and see if that helps it not stick so much. The mess is bothering you a lot, do you have a garage or laundry room or somewhere that would be better for managing that? It just occurred to me that you need suction to get the hair as you go, sort of like the dentist does with spit and what do you know they make such a thing.
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