[do]

I would also add: how well do you handle rejection and failure?

[arcware]

Good call. If you're not used to failing, and failing often, then this isn't for you.

[wan23]

Though on the other hand, how else do you learn?

[arcware]

Fair enough, but you can fail in something other than a bootstrapped startup and learn from it, all without risking your own personal stress, finances, etc.