Good luck
@Eddcorner
We had a hairdresser call at home when needed by prior appointment - lady is a friend of and recommended by our daughter - and did cut and colour - and very satisfactory.
Now OH's Alz's has advanced, she wouldn't be able to stay still long enough, and so hairdresser doesn't want to know.
I bought an inflatable bowl with gap for neck (and plug underneath for draining), so whilst OH is lying flat in bed, we surround OH with towels, then put her neck into the gap so that her head is over the bowl before putting in warm water for a hair wash, using a plastic cup to pour water over her hair. So far it has worked, but better with two persons on hand - one to wash/shampoo and condition and one to distract OH from moving and for holding her hands. After drying with towels (as she finds the hair dryer too noisy and hot - even on its lowest setting) I have a go at the cutting, if necessary. As it is better as a two person operation, I wait until our daughter comes to stay for a weekend.
(Because of the lock down, back in 2020, I bought a barber's razor, and I do my own hair now, once a month, and I'm still recognisable.)
Amazing what one can turn one's hand to when pressed!