If I was starting over I would find a coach. I know that it is fun to "do it yourself" - but there are a great many small things to be learned about this great game. Yes, you can get good on your own, but the time can be greatly shortened.
Every bowling center has a group of high average bowlers. Find one who makes it look as though bowling is the easiest thing in the world - ask him for help. Most bowlers are generous and willing to offer points to work on even if they are not willing to take on regular students.
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OnlyBowling