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I have a huge dreadnought (Taylor 310), which I need for playing with a group in a big room, and I make myself use it for daily practice because it’s so much harder to play – keeps me in shape for anything! (it also sounds wonderful) I’m a smallish female and getting my arms around it has been challenging – the classical position turned out to be the answer. I googled “women playing big guitars” and there are a lot of women who use this position with the headstock pretty high up, parallel to your ear roughly. Resting the guitar on your left leg, letting the big body drop between your legs, is a bit like sitting when you’re 9 months pregnant! Having a good firm regular chair has helped, no sofas. I have also found that 15-20 minutes of yoga a day, including lotus pose (or some variation), where you sit up straight and cross-legged for 10 minutes (build up gradually), has eliminated back/shoulder guitar-holding strain.