| Being fast doesnt mean being able to instruct. Depends how serious you are. A lot can be done with self research and notes, use of video, and practising those skills all the time on any ride not just track.
Even if you can get someones, on same bike, markers like brake, turn etc etc it shows what can be done as a gauge to where yours are now, then it becomes 'if they can, I can!' Mentality. Can be risky tho....riding styles make huge differences. Neil carries more corner speed than most so uless you adapt to carrying the same, you'll need to work out the differences... | 
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