Every writer has rituals about how they write.
The rituals often change over time; for instance, when I was first writing, I used to write either directly into email, which went to a group of my friends, or on paper with a pencil, later switching to pen. Eventually, I moved on to writing by hand, editing as I went, then editing on the fly as I typed the story on a typewriter. Every once in a while, when writing by hand, if the page got too messy, I would recopy the whole thing by hand, incorporating my changes.
These days, I still occasionally write by hand, but more often I write on a word processor. I edit as I’m writing, but I’m not sure how much; the process has become nearly unconscious. I’m not sure how much I compose in my head and how much on the screen. I do know that when I start writing, I generally go back over at least some of the previous day’s work, and often make some edits then.
When at last the manuscript has reached a point of near doneness (lightly browned? firm to the touch?), I print it out, and read it on paper. That’s a different experience for me from reading on the screen. The manuscript looks different, more real. Mistakes are more glaring in black letters on white paper.
However, I’ve just begun working more in email again. When responding to the near-final version of my last novel, I did so first by writing comments onto a printout in red ink, then by typing those changes to email to my editor. I didn’t actually need to print out the PDF manuscript, except that I felt more comfortable doing so. I wonder what future changes technology will bring to my process?