In only the context of preparation, there are two kinds of Bible teacher/leader/host/whatever they call it these days in the fellowship/Bible Study/Sunday School/etc.:
1. Those who focus on preparation of teaching.
2. Those who focus on pedagogy, already prepared for life.
And no, I'm not referring to time management.
The two types can easily be discerned. Just like the way we can tell if a mother baked her cake with love or not.