I had been doing web dev and marketing for years while working full time. I had a family and mortgage to support. But the time was right to go full-time consultant when I landed a client who was ambitious and had a lot of work for me.

This client also happened to be a "super-connector" who told everyone about me and how good I was, so that helped.

My advice: learn how to market and start planning now, be patient, ask God for help, and you will surely have your own business.