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I'm in band, currently playing trombone. The way you can improve is by praticing. Take baby steps toward what you want to accomplish. Like, for improving your posture, do it step by step. Also, you might want to put some water/slide grease on your slide if it's having a hard time moving. C is 3rd position and D is 1st. Though it does all depend on your tuning.
on April 12