A Former Employee Returns

Today an old employee of the funeral home came by. He had worked there for a while, but about six months ago he left, for reasons not known to me. He came in today to ask for his job back, which he got. This person is a very experienced embalmer, and in our owner's words, a very good one. I will be learning from him, but I'm not sure what it will be like working with him. I'm told he has some quirks, and that he can get impatient. I can learn just about anything that I set my mind to, but I don't want to learn it on someone else's timetable. I don't want him mad at me that I can't do certain tasks just because he showed it to me once and then expects me to be an instant master at it. I hope he's a patient teacher, and that our personalities don't clash.