1). It depends on your purpose. if it matches your purpose and fits in then naturally do the exercises. If it isn't your purpose to work on that or to know that then there is no point in doing the exercises.
2.) Decide what your purpose is. What do you want those books to do or help you with in your life. Then use what works. Books like "What Color is your Parachute " are filled with possibilities and ideas that you can put into action. They only work if you know where you want to go. Then you put the idea into action.
Alex
