The fact that every big name author you can name did NOT make a living writing before they were famous shows that people are quite capable of writing and still holding a day job.
A lot of people burn the candle at both ends for a while to try and pursue their dreams. It's generally unsustainable. Either you decide you can do it and make the leap, or you back off, or you burn out and go splat.
There's also the matter of slowly ramping up. It's possible to get lucky and have some success with something you put only a very limited amount of resources into (because that's all you had at the time) and then to use the resources gained from that success to be able to devote a little more to your next try, and so on and so on.
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A lot of people burn the candle at both ends for a while to try and pursue their dreams. It's generally unsustainable. Either you decide you can do it and make the leap, or you back off, or you burn out and go splat.
There's also the matter of slowly ramping up. It's possible to get lucky and have some success with something you put only a very limited amount of resources into (because that's all you had at the time) and then to use the resources gained from that success to be able to devote a little more to your next try, and so on and so on.