This is a really interesting project that someone has begun. The purpose is to collect the experiences of how various people wrote/write their PhD thesis. I find it very interesting and comforting to read this different experiences. As it says, there isn't really a good and a bad way to write, provided that you get things done in the end.
So what I would like to say, to those who are now writing their dissertations and feeling frustrated with their own progress, lacking confidence in their abilities to carry out their projects, is: KNOW YOURSELF. Are you able to be a disciplined writer, who puts down a couple of hundred words – or even a whole page – every morning? If so, God bless you, you are one of the lucky ones. That’s your process, and it’s a remarkably sane and productive one; I often wish I could work in that way. But if you find yourself thinking about many different things at once ...maybe you simply are that sort of thinker. If so, embrace your process and celebrate it.