I think this video would've helped me if I'd known about it when I started. Or it might've made me feel totally incompetent.
So if you're tempted to try something like Zumba or Flashmob and this intimidates you, don't worry about it. All you really have to do to learn something is want to learn it enough to be willing to do it badly until you figure it out.
Guide to basic Zumba® Fitness steps - YouTube: