I want to add that this book has a lot of good advice for all sorts of jobs, if you look at how to apply it. Two advices I like are to list your next day's activities before leaving your work for the day, and to work out a blocking system with coworkers so they handle incoming questions for you so you can spend the time focused. The blocking would be handled in an alternating fashion every-other day. It is a really quick read and written in a conversational tone - check it out.