You’re finished as soon as you say those words. You’ve set yourself up for failure. No, something less than failure, because you’ve already accepted, embraced an outcome with the same certainty as your next breath.
Infinitely better it is to try, no matter how feeble the effort. You have a chance. No matter how small the odds of success, it is opportunity measured as something greater than zero. And no matter how it turns out, you will have gained experience and probably a bit of knowledge as well.
