Its always better to let today be day one. We tend to put it off. We prefer to wait until we are ready. Day One becomes someday until someday becomes one day and then, never at all.
The easiest way to start is to begin. Create the pressure by committing to the course of action you have been simmering on. It might not be the best, or even right. The quickest way to learn that is to start.
Think about it. Tomorrow could already be day two. What are you waiting for? Before you know it, you will be on the 1000 th day and what was once intimidating has become second nature.