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For the callouses, the chord exercises helped me the most (as demonstrated in 30 days to play). I practiced the open G using middle, ring, pinky a lot. I usually stop shortly after the pain starts so that by the next time I pick up the guitar again, the pain is gone, maybe an hour later or the next morning. The other thing is I don’t play right after washing the hands – let them air dry for several minutes before playing. I usually wait about ten minutes, or they will hurt for sure. It is the only finger tip tip I know of that definitely helps other than playing daily. Not convenient.