Is Happiness an Inside Job?

A couple of weeks ago I had the privilege and the honour to speak at the First ever Serious Waffle Session.
As a trainer and facilitator, I am used to standing up in front of people and talking to them. But I had never given a proper speech before!! Truth be told, I was terrified! Agreeing to give this talk was challenging me in more ways than I had bargained for. Is happiness an inside job?