Self preparation is nothing new and is often overlooked in incorporating into your daily routine or right before a big major event. The reason for a creed or a pep talk is to get you mentally prepared for the challenges that awaits for you for the rest of the day. You never want to do anything without being first prepared for something. Just like you would never take a test without studying first the same should be looked at when going into a big event or even on a daily basis to overcome daily challenges.
Once you coach yourself to success then you will manifest success from your thoughts to reality. Get into the habit of practicing this often. If you believe then you will achieve. Start believing.