Apologies if this veered too much off topic. I've been kicking this around for a week or two, and felt the need to add recent events and post.
It's 5am, I haven't eaten in 12 hours, had anything substantial to drink in about 8, have been sitting on the toilet for over an hour, and instead of doing something about any of those things I'm editing a comment to fix a typo.
Moving a little rock is easier than moving a boulder. That is the point. Smaller individual task -> less anxiety.
But then you look at a gravel field and get overwhelmed to stay with your metaphorical picture. Yes, that is part of what happens with ADHD and detailed lists.