I like the analogy of a physical trainer or coach using cues to help the trainee perform a movement correctly. They translate their knowledge of bio-mechanics

I like the analogy of a physical trainer or coach using cues to help the trainee perform a movement correctly. They translate their knowledge of bio-mechanics and human anatomy to sensory information a non-expert can use to take action. I think that may be the formula: Having trust as an authority and being able to communicate actionably. Miss either one and the "consumer" won't or can't take your advice.