Do you build a paper A) sentence-by-sentence or B) by starting with a rough structure that you then flesh out?
As you think about process, here is some food for thought:
On a given writing project, professional writers probably spend about 30% of their time planning, 20% drafting, and 50% revising. So they're more likely to follow B than A.
If you have the structure of your document right, it's much easier to flesh it out. But if you're writing sentence-by-sentence, and the structure needs to change or ends up being weak--well, you might have to start all over again! No one has that much time.