For what it's worth, it looks a lot harder than it is. Like anything, it's a matter of practicing a lot, and on the smaller wheels dismounting is about as dramatic as stepping down a single stair. It's just when you decide to go face-first over your 36" in front of a group of highschoolers that you tend to hurt a little more.

Not sure if you know this or not, but according to legend the Penny Farthing gave birth to the unicycle. People had their rear wheel fall off and managed to keep the gigantic front wheel going for a while, and that lead them to say "hey, maybe I can just use this by itself!"
It's all a matter of continutally making a pratt of yourself until suddenly you aren't.