It’s really a good question for any ministry leader: paid, volunteer, full-time or part-time.
I suspect the key (for a whole organisation) is that the senior ministry leader can and does accept criticism and feedback without getting all defensive. If you’d like to test me, I won’t be offended. Honest!
PS Pity all the preachers called Johnny. Perhaps the publishers have a new marketing strategy to adopt – personalised books. “For just $20 set up fee plus individual book price, you can print as many copies as you like of Why Chris Little can’t preach.”