I think it was Mark Twain who one said that eating a live frog early every morning means you know the worst is behind you and you can get on with your day with confidence. (Literary quotes are often difficult to attribute … most of them have allegedly been said by Oscar Wilde or George Bernard Shaw.)
In your business life, the equivalent practice is to start the day with an unpleasant task – something you want to put off but know you shouldn’t. Get it out of the way (and the day) while you are still fresh and still have energy … you will tackle it better… and then the rest of the day is unsullied by this fearsome task. You will work more productively without the threat of it hanging over you.