Need help to appoint a caregiver..!!

Hey, My father in law is 88 years old now. He is an independent man. He is a careless driver but never had an accident yet, he used to cook, but his cooking has poor hygiene. He won’t let anyone help him with cooking and bathing.
My mother in law passed away four years ago. He was her caretaker until he could no longer help her in and out of the bathtub or help her out of bed. He loved her a lot. He doesn’t like anyone taking care of her other than him but finally admitted that he couldn’t take care of her properly and agreed to approach a home health care service in Toronto. He felt guilty, but she was being looked after so much better than the care he was giving her.
I know my father in law will be the most stubborn man when it ever gets to the point of trying to talk to him about appointing a home health care service to take care of him. He is very weak now, can’t do his daily routines by himself. He is not ready to change his mind. How can I convince him about appointing a caregiver? Do you have any advice on how to deal with a situation like this?