Problem: Rig your own hand model and skin it
Solution: I tried rigging my own model but unfortunately the paints just won’t work right and I was getting some points that would move with another joint but were not paint at all.
Thus, I decided to use the model provided to skin and make poses. I used lattices on the joints at the knuckles and then simply rotated the joints as required. At points where the mesh would not move as required I made modification to the weights using paints.
Below are the hand poses!