The subtitle for this book is probably the more telling about the contents. This book is more of a guide to the whole process of writing the dissertation rather than the physical act of writing. Bolker discussing the writing as well as choosing a topic, choosing an advisor for your dissertation, and choosing a committee for your dissertation defense. Covered in the book are some of the psychological barriers that can hinder your finishing the dissertation, and some pitfalls to avoid (such as political battles with your advisor).
The primary thought is to develop the habit of writing. Some of the ideas may sound familiar to you, but they are no less true. Bolker states that you must develop the habit of writing everyday if you are going to build up the stamina and fortitude to completing the task. She does suggest a support group to assist in this.
The biggest draw for this book, for me, was that Bolker is an authority. She started two dissertations, one of which she did not finish. She has also worked with many students in writing their dissertations, and she knows from experience what works and what doesn't (she points out a problem that can arise from writing solely on the computer).
I would recommend this book to anyone beginning the journey to finishing a dissertation. Do not take this information lightly.