Honestly, if I were uncomfortable in any way, I would just decline to provide services for that reason. I would say that I didn't feel equipped to manage his care.
I know it sounds as though there is no risk and I am not arguing that there is or isn't....just that if YOU don't feel comfortable, then you shouldn't do it at all.
That is a lot of stress and I know I too, would be so worried all the time.
What if this? What if that? etc etc etc....