The absolute best way to pick this up is to do it with the help of an in-person instructor. It is a motor skill that is best learned by trial, error, and the emulation of experts.
Your local culinary institutes might offer courses or one-day workshops on various topics for the general public and cooking enthusiasts.
For instance, here's a place in Maryland that offers classes: L'Academie de Cuisine. I once gave my wife a gift certificate for their "knife skills" workshop. She can now chop circles around anyone who isn't a chef!