I'd take heed of what Dan says, anonymous user, if I were you.
I'd echo this too.
And I'd make damn sure that the teacher had the real stuff if I was going to stay around. There is lots of baloney around there. But the real stuff is like gold. It may be that it is worth the wait working on this kiso, that is, if he's got the knowledge to make it for real.
Now as to how to tell if he's for real: well; that's a good question.