In Episode 25, Eddie shares how training for an ultra race, on tired legs, can help you in reaching your goal. By sticking to your goal or commitment, you are proving to yourself that feelings are not in control, but the process of what needs to be done is the main objective.
Yes, each circumstance is different, so there is no "one way" to do it, you'll have to be aware of the scenarios.
If you are committed in reaching a goal or objective, all the days leading up will not be the preferred circumstances of your choosing. There will be days in which it is definitely about the process.