Sometimes the way to do what you hope to do will be clear cut, and sometimes it...

Sometimes the way to do what you hope to do will be clear cut, and sometimes it will be almost impossible to decide whether or not you are doing the correct thing, because you'll have to balance your goals and hopes with feeding yourself, paying debts, finding work, settling for what you can get.
Something that worked for me was imagining that where I wanted to be – an author, primarily of fiction, making good books, making good comics and supporting myself through my words – was a mountain. A distant mountain. My goal.
And I knew that as long as I kept walking towards the mountain I would be all right. And when I truly was not sure what to do, I could stop, and think about whether it was taking me towards or away from the mountain. I said no to editorial jobs on magazines, proper jobs that would have paid proper money because I knew that, attractive though they were, for me they would have been walking away from the mountain. And if those job offers had come along earlier I might have taken them, because they still would have been closer to the mountain than I was at the time.