The first step to start making some changes in your habits is to constantly be aware of them. This means to be here and now and keep the track of what we do at the moment and be mindful not to do it automatically. To accomplish this, it may be very difficult and it takes a lot of practice. But doing this, you will be able to detect the bad, unnecessary habits and begin to look for causes.
Please refer to the book for more details on this activity.