Is it really as easy as "grit and discipline"? I find it hard to believe. Everything I've read about consulting work, indie gamedev, and one-man-SaaS apps has a similar message: that previous experience and luck are huge factors, and there's a lot of financial risk involved. Small businesses fail all the time for reasons other than lack of grit and discipline.
Previous experience is grit and discipline. The amount of it will have a considerable impact on anybody's success. Luck will help that extra bit that only people doing things will get.
