Accept where you start.
I think we all have a tendency to dream big but not really see ourselves as part of that dream. We see ourselves as outsiders looking into something and being separate from it.
I often hear people talking about fitness ideals, whether it be running a marathon or just feeling healthy and active again and then comparing it to their current state. "Oh, I'd love to run a 5k, but I can barely get off the couch."
Exercising and fitness goal setting has taught me to accept my current state so that I know exactly where I am, what I have to work with, what course of actions to take etc.
Accepting wherever you are in life makes navigating, not easier, but a possibility.