There's always this thing people say "oooo hands are so hard" or "oooo portraits are the hardest" - to be honest, it's all pretty hard, BUT it can be simplified, in actual fact, hands are a shape, made up of shapes, just like the face and the figure. It makes it so much easier to digest thinking of it like that. At iAnimate, we had a great lecture from Stephen Melagrano about appealing hand shapes, describing different poses like
leaves, for example. Anyway, after watching Rad's old lecture yesterday, I found another on his blog "Hands and feet" and it's great, and i'm only a little way in. Check it out
here.
I'd definitely recommend spending some separate time on studying hands and feet, as these are some of the most important tools in gesture. As stated in "Drawn to Life" - you can read a pose with just hands and feet, but the pose isn't as clear if you just draw the torso. I think it's important, as it can be a common thing in life drawing or gesture drawing, and you see multiple times the feet and hands are cut off. They are essential body language tools, and definitely one to keep an eye on.
I've started a small board on hand references
http://www.pinterest.com/indi_pops/hand-references/
and have a ton of different feet and hands and body l; language references on animpin
http://www.pinterest.com/ejsu28/reference-feet/
Maybe watch one of your favorite movies and sketch the hand gestures, it'll really help if you're into animation too. Man, I need to go draw now.