Bootstrapping is hard. It is basically a self-test, which tells you whether you gonna make it or not. It requires years of solitude, self-discipline, persistence, much like classic (no nonsense) Yoga of Patanjali.
You have to start from nothing and establish you as a self-supported freelancer in a 6 months (every day you will lose your savings money or go deeper in a dept). This is what it takes to make it.