One day or day one; you decide.
Never let the fear of the future scare you. Many of us believe that we have all the time in the world to do what we want and do it whenever we have the courage to do so, but why wait to do something when you’re thinking about it now? If you want to start working out and go to the gym, start today. If you want to sign up for a music class, start today. If you want to go and get your permit or driver’s license, start today. The “one day” isn’t guaranteed, but “day one” is.
In other words, live in the present, so do things in the present.