The following comes from "Time Power" by Brian Tracy and is absolutely one of the best books I've read on time management:
First, remember that your self-image determines your performance. You always perform on the outside in a manner consistent with the picture you have of yourself on the inside.
Second, remember that it takes about twenty-one days of practice and repetition to form a new habit pattern.
Third, promise yourself that you are going to become excellent at time management.
Fourth, in developing the habits of time management, start in just one area where poor time management is holding you back. Don’t try to change everything at once.
Fifth, launch your new time management habit strongly. Never allow an exception once you have decides that you are going to become excellent in a particular behavior.
Sixth, use the “trial and success” method rather than the “trail and error” method. The trail and success method requires that you learn how to succeed by failing, and then by learning from your mistakes.
Seventh, and perhaps the most important of all, is for you to absolutely believe that you can and will become outstanding at time management.