If we're talking indie game development here, I'd recommend getting into it in exactly the way as Patrick got into BCC. It should be approached as a hobby, until you're making enough money reliably enough that it becomes feasible to quit and do it full time.
That way you don't burn through your life savings, and you're very much aware of the day to day. Bonus points if you've had failures in between your successes. Patrick is dead on here - it's not all roses.
If you can't succeed doing it for 10-20 hours a week as a hobby, it's doubtful working even 80 hours will work. Game development is sort of like being a musician. If nobody likes your songs, you can't make up for it in volume.
Game development is an irrational choice in terms of return on investment. Patrick is also dead on here. Even the successful developers would have made an order of magnitude more money if they had applied themselves equally and had the same luck in other industries.
You have to genuinely find the prospect of working on your craft full time more important than financial returns. And having the perseverance to hone your skills and produce successful games in your spare time, even if it takes years, is a good litmus test for that.
(I'm awkwardly referring to patio11 by his name even though I was replying to him to differentiate the you [him] from the you [in general]).