I have worked with coaches, including, but not limited to, Ron Clifton, of Magic Carpet and NC BallReviews.com gatherings.
My others have been Michelle Mullin, of PBI, Mike Jasnau at Lane 81 in the NBS in Reno, and of course, Bill Spigner and Brian Chilcutt at Hawthorn Lanes, where I work part time and bowl.
Having a coach is something I would recommend to anyone and everyone. I am another self-taught bowler. I suspect that is similar to the fellow who is his own lawyer and has a fool for a client.
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RW (THB)