Hey checkmate. I used to take lessons and I paid 15 bucks a pop for half hour lessons.
I think the main thing that you should ask yourself is... How good is the teacher. If you can find a great teacher with a great method, then paying for lessons will be the best thing you have ever done.
However, this is not as easy as it sounds. A guy sitting in a guitar shop who just wants to teach you how to play stairway to heaven is NOT a good teacher.
My advice: Shop around and find a teacher who is worth the money.
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Rhino
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