Coaching will pay you large dividends- even if you only go for a short time. Reading suggestions online and through books and magazines is one thing- having another human really look at your game and hone in on some areas you may not have thought about is something that is invaluable.
Before I sought out a coach in January, I was bowling very well in one house and struggling in the other- and I noticed my timing was poor. After a couple of sessions my timing improved amazingly and I developed a better understanding for what I needed to do in terms of approach, ball speed, hand release, technique, and timing in both of my leagues as well as what to look for in tournament action. I'm getting ready for my 7th coaching session in a couple of weeks and my confidence has been as high as I could ever imagine in my 30 years of bowling.
Matt