This is great, too, and I think there's a PDF floating around:

https://www.amazon.com/Self-Discipline-10-days-Thinking-Doin...

It's practice, and also, it'll get easier as you get older.

This book is a massive PITA to get your hands on (in some countries, perhaps it's back in print?), but a life-changer:

http://www.amazon.com/Self-Discipline-10-days-Thinking-Doing...

I'm so bad with procrastinating, in fact I'm avoiding work right now! I've found virtually all the books and blog posts useless, but this one really made me think differently.. http://www.amazon.com/Self-Discipline-10-days-Thinking-Doing...

a quick search shows that it was republished: http://www.amazon.com/Self-Discipline-10-days-Thinking-Doing...

I haven't read it, but looks interesting.