Ken Day wrote: [...]
Many people think anyone can teach what they know. Fact is that the better you are at your job, the harder it is for you to see it from the uninitiated person's point of view. You have in fact forgotten what it was like not to know how to do that "simple job." So you don't really know where to start.
Fact is, a "simple job" rarely is. We all tend to assume that because a job is easy for us to do it must be simple. No job is simple or easy for a person who hasn't learned how to do it. A good teacher can figure out what the student knows, and more importantly, what (s)he _doesn't_ know, and go from there.
HTH