Once before you do anything, and then again as you go through your actual ethnography. Reading the whole book in its entirety was quite helpful in helping me to see the big picture of the final product as a beginner ethnographer. Great read and very insightful.
This book is full of good information and guidance.and I learned quite a bit from it. Soon I will be in the early stages of writing my dissertation and I feel more confident about it now. This is a great book to have on hand especially as an addition to the class text book.