As an individual:
Keep this book close to where you work so you can check occasionally to see if you are following these ideas. Take time daily or weekly to reflect on these lessons and make them part of who you are as a manager. Some managers like to focus on one lesson a week, reflecting on the lesson and how it is manifest in their day-to-day work.
As a group (highly recommended):
Short group conversations about each lesson, again perhaps one lesson a week, will help you to internalize the lesson and make it more immediately applicable to your day to day work. These conversations can be over lunch, over coffee, or even online. But explore, analyze, expand, reflect, and apply. Then provide each other feedback.