What Self-Help Has Helped You?

An open question post on LessWrong inviting users to share one self-help technique per answer, with context and a guess at mechanism. Most-upvoted threads include moses on the multiplier effect of doing things with or through other people (quitting cigarettes and weed cold turkey by leaning on partners), Worley himself on metacognitive frames, Adam Zerner on habit design, and many more. Functions as a crowd-sourced index of what actually helped this rationality-leaning community.