When analysing football matches, the mistakes made and chances not taken, former manager Ron Atkinson often talked about "The Three Great Bulgarians" - should've, would've and could've.
Off the pitch, these three play a role - sometimes minor, sometimes major - in all our lives and it's never easy when they are a part of the explanation for things done or not done.
If you're fed up with hearing them in your own head, then have a think about reading this book.
A psychologist and management consultant, Grace shows you how you can give yourself a professional and personal overhaul - identifying what you are good at, your values and your working style, how to sell "the brand called you" and visual positive outcomes when you're convinced things won't go to plan.
Of course, reading about something and actually doing it are two completely different things, but this book is full of exercises to help you and while it may take a few weeks to get through all of them, you'll learn more doing one each night than from an hour spent in front of the telly rehashing things that happened during the day.
Often the biggest barrier to achieving the things we want is ourselves and our own internal monologues are chock full of things we wouldn't dream of saying about another person - it doesn't have to be that way. And even if you're happy with (and lucky enough to have) the job you're doing right now, Grace has lots of advice on how you can improve your performance and get more out of life. Her tone is practical not preachy, the further reading list is excellent, and by the time you get to that stage, you should feel better about yourself than you did when you first opened this book.