He told Sky News: "It was really difficult. It took me a long time to come to terms with the fact that I was going to make it... when I retired, I wasn't ready to talk about my career and talk about what had happened over that time.
"Because as much as people think they know everything about us, [they] don't really. We don't really let kind of those doors open to our house... I'm not going to lie, I hated probably almost every moment...
"Finding the right director took a while... But then when I met Fisher, I was like, okay - this is the man that is going to make me feel really uncomfortable. And I think I had to feel uncomfortable to make the documentary that we made...
"Fisher made me feel uncomfortable from the moment we sat down to talk, to the moment I finished. And I really needed that because I needed a director to come at it from a different angle. Because everyone kind of knows my career and my life and things like that. So I needed someone like him to bring something different out of me."