I'm one of these people with too much on my plate. I've grown an ability to schedule out my days/weeks in my head and mostly stick to it, to accomplish the most possible in the most efficient ways. However, it has taken years of single-parenting and working simultaneously, and if I try to do even a tiniest bit too much, that's when I will always make some awful mistake. It has finally taught me to accept my limits and never try to overachieve.