So the previous guy was just made of floating blocks which was simple to animate. However when you work with more realistic things, problems can arise like how the skin of your model reacts to being bent. Those areas tend to get smashed or distorted or worse. Above is the skeleton I made that goes inside the hand. Then I bent the fingers and my book showed me the various ways I can fix deformities around the joints. None of the methods seemed particularly quick and easy or produced great results though. I was going to animate the hand to flash some gang signs or something but I wasn't happy with the initial skeleton set up they had me do so I just moved on.