A lot of us are "self taught", and quite a few of us took lessons later and were shocked at how much we were doing wrong. Believe me, unlearning bad habits is hard. Do yourself a favour and get a lesson or two early on. Private if you can afford it. You'll actually find that you progress faster after that.
When we were in Steamboat this past January I was against the lessons. I have been wakeboarding for years so I thought I could get snowboarding down pretty quickly. You know, same concept, board strapped to your feet and use your hips to maneuver. WRONG. My girlfriend talked me into a full day lesson and boy am I glad she did. wakeboarding is nothing like snowboarding other than the board being strapped to your feet. So, when I get to Breck in Dec. I'm definitely taking lessons again. Thanks for the awesome advice.