To make things easier,beside the bar where it shows how good a villager is in a skill(trainee,adept,master) it could say something like x amount of experience until adept...this would make things alot easier because you acctually know how close someone is to becoming a master or something.You would also have to find out how much experience doing something gives you(something like getting a fish gives 5 experience for farming and a crab gives 10 experience for farming.