This book has to be my top recommendation.
A brilliant, hilarious homage to The Life-Changing Magic of Tidying Up, showing how to shed your mental clutter for good. Aimed at overachieving but dissatisfied people everywhere. Sarah’s inspirational two-step “NotSorry” program shows how unleashing the power of not giving a f**k will help you shed unwanted guilt and obligations to redirect time, energy, and enthusiasm to your true priorities. Sarah reveals why giving a f**k about what other people think is your worst enemy-and how to stop doing it; how to sort your f**ks into four essential categories; simple criteria for whether or not you should give a f**k (i.e. “Does this affect anyone other than me?”); and the two keys to successfully not giving a f**k without also being an a**hole. So, get rid of the mental clutter, ditch the perfectionism and create the life you want – for good.