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If you're in the US, and not living with your parents (and or don't want to do that), one of the best ways to do it is to live in a university town. They're wired for fast Internet, the cost of living (including rent) is often very reasonable, they're among the safest areas in the US on average, and you can work at mundane jobs to pay your bills (30-36 hours per week; telemetry tech at a hospital; cashier or lead in retail making $15-$20/hr; etc). In the typical university town you can rent for $650-$1000 for a 1 or 2 bed + 1 bath apartment in a safe area. Working for a hospital you'll also usually get solid health insurance. The jobs are not difficult, they're relatively easy to get, although they will grind on you when combined with doing a startup (it's part of the trade you're making). Also in these types of jobs you won't have much if anything to worry about regarding intellectual property issues, conflicts of interest, et al.
Source: have done this, it works quite well. It can be exhausting working 80-100 hours per week obviously. The income/job becomes a permanent stream of venture capital, you can just endlessly fund your own way and keep 100% of the pie. I've often chosen to not do tech contracting work while working on a startup and self-funding with outside income, because I don't like the potential IP risks/conflicts and the burnout factor of always working on software/services/sites/whatever.
