You’ll never feel fully ready. Ready enough is the only kind of ready anyone gets.

Ready is not a condition that arrives before you begin. It gets manufactured by doing something a few times, so waiting for it means waiting on a product that only appears downstream of starting. What you can actually have beforehand is enough: enough preparation, enough information, enough nerve for the first ten minutes.

Set the bar at enough and define it before you start. If you can handle the opening and the obvious problem, go. The rest of readiness turns up while you are already inside it.