I recommend filing the fingertips with very fine sandpaper once a week if you are playing more than two hours a day, and when not playing, moisturizing with moisture balm, wildroot, or pond’s dry skin cream. Ideally, you want something with lanolin in it. When you are going to play, your fingers should be clean and dry. Wildroot is a hair cream. There are different types of skin. The harder your skin gets, the more often you need to abrade it, but the fine paper is much better than an emery board, which can tear your skin.