Just for clarity here is the scale:
The Brian Manzella Scale of "Real World/Live Lesson Giving" Golf Teachers.
F = Can't teach, Can't demonsrate, teaches bad information, doesn't relate to students, everyone who works with them gets worse.
D = Every Day, run-of-the-mill, guy at the local course. Doesn't know any theory, doesn't want to. Can demostrate some. Can relate some. Some students get better.
C = Knows some theory, has studied under someone who has a clue. Maybe has their own method. Can relate to 50%+ of their students. Has developed some good players from scratch. Can help Mrs. Fabersham get it in the air AND not mess up Nicklaus before he tees it up.
B = Very Good teacher. Knows multiple theories. Has some undersatnding of science as it relates to golf. Can teach 75% of all players to improve without bastarizing. If their method is a good fit for a Tour player, they will help them. Often has just one basic appraoch for all, however.
A = Great teacher. Knows a lot of theories by heart. Knows plenty of golf related science. Can relate to 99% of students and help 90% of them in MULTIPLE WAYS. Can get Mrs. Fabersahm to break 90 AND HELP a TOUR PLAYER go win today.
A+ = Knows just about every theory that ever came down the pike. Could teach them all by him/herself or along with the person who "wrote the book." Can relate to 99.9% of all students and can get them ALL to hit it better today without BASTARDIZING. Teaches multiple patterns and multiple ways. Usually good with Juniors of any age and could tell you why every teachers stuff works and why it doesn't.
To answer your question, yes I feel like I am an A+ teacher.
But on that "grading scale," I think you can be an A+ teacher and...
(a) Know about 50% of everything there is to know,
(b) Be about 60% right about knowing exactly what to teach in a certain situation
and...
(c) Be about 70% as good as possible getting people to do what you want them to.
Here are my self grades on these three elements of teaching golf:
(a) The What - 65
(b) The When - 75
(c) The Get-em-to - 85
I have a long way to go, in my opinion.
How long to get to a minimum of a "low A+"? (i.e. 50-60-70)
Depends on who that person knows, where they get to teach, who they get to teach, and how bad they need to be good at it.
Best case scenario, 10 years.