Risk management in leaving your 9-5 to pursue your business full time?

I always see interviews or podcasts with successful entrepreneurs saying they “took a leap of faith” and left their full time job to pursue their business full time which eventually helped them achieve their success. While I understand this, I can’t help but wonder how feasible this is in terms of your stability and where you are on your entrepreneurial journey. But i also know many of them had support from family they could rely on if things didn’t pan out as they should or other forms of financial support they don’t discuss when it comes to the risk management it took for them to be able to leave their full time job.

My question for some of you is - at what point in your journey did you know it was okay to leave your full time job to pursue your business full time?