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For your hip turn, try something I saw on "The Golf Fix'. Imagine a swim noodle going through both hips, and sticking out both of your sides . Now when you start your swing imagine that you're turning the swim noodle counter clockwise, if you're right handed .
For your arms pulling in, try something a golf instructor had me do. Swing with your arms in a coat hanger. Make sure you have the coat hanger, with the hook end turned down. Its not the most comfortable drill , but it will stop you from pulling your arms in.