No personal experience, but when I was student nurse (in the late 1980s!!) I worked on a children's ward of a hospital that had the region's renal unit - there was a boy on the ward who, at the age of 4, could manage his own bag-changes for CAPD (continuous ambulatory peritoneal dialysis)! So I'm sure, if he's suitable for this type of dialysis, your husband will be able to manage it easily.
Have search around the internet for renal support forums (UK based, assuming you are in the UK) - nothing beats getting support and advice from those who know exactly what you are going through. I hope all goes well.