I've had my uke for about 2 months and have been practicing religiously. First, how can I tell if I have developed calluses? The tips of my fingers seem more firm, but I don't see that much of a difference. Second, will I ever be able to moisturize my hands again? I'm a little hesitant of putting on lotion because I know adding moisture to dry skin softens it, and I wouldn't want to get rid of my hard callus building work!