You know you need to say no more, right? And you know that, in theory, there must be a way to do it without coming across as the world's most arrogant, selfish, and uncooperative person - but you just don't know how to get there from where you are now. Well, actually, you do know. You prove it every time you think wistfully about how that confident, fearless colleague of yours would never have agreed to that daft commitment that you just said yes to. Assertiveness is easier than you think. To find out more, let's go back a couple of thousand years and try Aristotle's bitch boots on for size.