Money Fear

I am about to establish my Coaching Business and have decided that i need to quit my corporate job to have the time I would like to spend on the business. At the same time, I have an immense fear of what if it doesn’t work. I am not yet ready to be in a place where I can say confidently that I am willing to experience to emotions of living under a bridge. Am I imagining too much drama here or do I really need to be willing to experience this first before I leave my job?