Ready is a feeling that usually shows up about halfway through.

Confidence is produced by doing the thing, not by preparing to do it, which means waiting for it keeps you permanently at the start. The sense of being ready arrives once you are already committed and have discovered that the difficulty is manageable. Before that there is nothing to feel confident about, only a prediction.

Set a date for beginning rather than a condition. Accept that the first stretch will feel premature and go anyway. Check how you feel at the midpoint, which is where the answer actually lives.