Writers can manage some of the chaos in their lives by encouraging a similar attitude in themselves. Particularly in situations in which we've set up short-term objectives around a schedule, we have to be careful not to fall apart when (notice I didn't say if) the schedule can't be adhered to as we fantasized it would, when we can't reach the behavior we were hoping for.
Falling apart causes chaos.
A Case In Point
Last month I took part in FlashNaNo2020. The plan/schedule for that was to write 30 flash stories in 30 days. I veered off into flash essays and memoirs, so I wasn't sticking to the plan for that right from week 2.
It also became clear at the end of the first week that I wasn't going to meet the planned, "correct behavior," writing 30 pieces of flash in 30 days. I had to put that correct behavior aside and accept that I was going to have to approximate it. The alternative to approximating correct behavior would have been to give in to the dread what-the-hell effect. "I'm obviously not going to hit the behavior I want, so what-the-hell? I might as well give up on this whole thing."
The what-the-hell effect is a lot like what passes for chaos at my house.