It's a mindset. You believe it, you become it :).
Summary: People who hold entity theory about their traits (ie they believe their traits - like intelligence, sociability etc - cannot change) are not able to change. People who hold the opposite incremental theory (they believe their traits can change) can and do change and they specifically seek out situations that help them grow (they don't fear failure and they like a challenge).
Everyone can pretty easily switch between entity and incremental theory by as much as reading a news article. Of course the long-term belief is rooted in deeper values but fot that you'll have to read the book. It's definitely worth it. IMO one of the best books a startupper can read.
If you want to procrastinate less and right away you begin to finish things that you've been putting off, well then you've already won. But if you keep putting off the day when you'll stop procrastinating, well you can see where that's going.
I think most people underestimate their ability to hack their own personalities.
It's easier for an unimaginative person to convince themselves that they're imaginative than for an imaginative person to actually become imaginative. The illusion that you're King of England can't be maintained for long. The illusion that you're good-looking can be maintained for a little longer. The illusion that you're determined, imaginative and... naughty... can be maintained pretty easily.