I'll link to my comment in another thread:<p><a href="http://news.ycombinator.com/item?id=1084790" rel="nofollow">http://news.ycombinator.com/item?id=1084790</a><p>Summary: You also can't get started being a surgeon by taking your pets apart and putting them back together, but people still go through years of medical school and become surgeons.