I'm sewing a curtain for my daughter's room and it occurs to me that sewing is like painting is like writing.
Before I can actually sew the material in my sewing machine, I need to measure (twice, thrice!), cut it at just the right spot, and iron the hem so that it will be straight. Then I can sew.
Likewise, when I paint a wall or a flat, I have to measure, check for dents and fill them, put down drop cloths, tape the edges, then I can use a brush to cut in, then I can do the big roller painting.
As with writing: I never merely sit down at the computer and the words flow from my fingertips to the screen. Hah. That'll get you if not gibberish, then blather. I research, I figure out my characters - their wants and needs, their obstacles and strengths, their quirks - and I figure out my plot. And, once I've begun to picture it and can hear the characters in my head, then I begin writing.