Ingest the Positive.
"Defeat" is a limited concept. It is important to choose whether it serves you to really believe in it. If you set out to achieve something and fall short of reaching your goal, does that make the entire experience a losing venture? Don't you usually emerge with greater insight about yourself as a result? It sounds a bit idealistic and you may hear the angry voices in your head rise up in resentment, but it comes down to where you want to invest your energy. Regret has been proven to be a bad investment. You must ask yourself if the often fashionable "would've, could've, should've approach" to life leads to a more joyful existence. If not, what's the point?
Success or sabotage? Don't allow yourself to be governed by the restrictions of fear and expectation. Is success really success if you're not free to enjoy it?
Is this going to be an incredible day? Ingest only the positive and allow those things that tempt you to surrender to negativity to fall to the side.