K.Z.
I would say don't worry too much. He will get it when he is ready. I wouldn't make him clean up after himself. I always help my kids with that stuff. I would talk to him about it. If you go pee pee in your underwear this will happen. What do you want to wear? Eventually, my son got it after some accidents and was OK. If he said he didn't want to wear them though, I would give him a break until he was ready. I also didn't need to rush it.