This video from ASAPScience (via The Atlantic) is good:

via YouTube

My experience writing The Distraction Addiction followed many of the rules the video describes: boosting your productivity by dividing big projects (like chapters) into smaller, easier-to-deal with pieces; making it easier to get started (for example, by stopping in mid-sentence the day before, so you could start more easily the next morning); having a disciplined but realistic schedule; and alternating intense periods of work with breaks.

All easy to say, but a challenge to do. But just get started, and you’ll figure it out.