I think beginner books are easier to get to that 50%. The subject I'm teaching really isn't that hard, it just needs to be explained differently. So, that said

I think beginner books are easier to get to that 50%. The subject I'm teaching really isn't that hard, it just needs to be explained differently. So, that said - maybe it's not feeling like an authority, but more feeling like you have an alternate/interesting/different take on a subject.