Ask HN: How did you gain your first, your 10th, and your 100th paying user?

If you’ve bootstrapped an app or a SaaS business either as a solo founder or with a small team, - How did you gain your first paying user? - How did you gain the next 9 paying users after that? - How did you gain the next 90 paying users after that in turn? Also: - What was your economy like, and how did you survive? Did you have savings that you lived off of for example, or a daytime job?