I learned how, from a book. As I was working on it, I messed up slightly, with every step, so I had to do them over, and over, and over, and over…you get the idea? After about a week of doing ever single step quite literally hundreds of times, I had it pretty well memorized, and started seeing little work-arounds to make it faster. My best time…was about 30 seconds, because it kind of fell into place, without too much work. My average time, though, is between a minute, and 1:15.
And yeah. It’s always great fun to be sitting in class with nothing to do, and pull one out of your pocket, and start messing with it—there’s always someone there who’ll want to mix it up for you! =]