Richard Aberman, a co-founder of WePay, writes that there's no substitute for experiencing just how tough it is to start a business (blog.wepay.com):

"Paul Graham says that good startup founders can be described in two words: relentlessly resourceful. I agree, but I would add two words of my own: arrogant and naïve. Arrogant enough to get in the ring, and naïve enough that you still think you will win after you feel the first punch."