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I struggle with neck and shoulder discomfort, too, after playing for awhile. Check out Tony’s Daily Stretches course in the Skills Courses section – they do help. Some people suggest using the classical playing position, with guitar on your left leg and held at an upwards angle, but I’ve not given that a serious try so far. I’m wondering if using a shoulder strap and playing standing up might help. As for size, I avoid the dreadnought style guitars, finding them too awkward to reach my right arm over to play comfortably. I have concert hall size acoustics, and a Taylor GS Mini, which is very light and easy to handle (though it does have a narrower neck which presents other challenges!)