I would recommend working part-time, busting your tail, all while saving for a second machine, insurance, etc. Once you have saved enough to make the jump, by a back-up machine to rid you of those worries, and go for it. If youre good at it and represent the industry well, than you will succeed.
There's a difference in 1.making a leap of faith and 2. sitting down and calculating optimal launch angle, velocity and wind speed before you make your leap of faith.
Sorry for the dorky physics analogy, but I think it applies.