This concept is similar to many other areas of life. We sleep in a certain place, shower in a certain place, eat in a certain place and go to work in a certain place.
Choosing a special place to write your book is no different. By choosing a special place to write, it will create an atmosphere of creativity. Each time you head over to your "writing spot" you will be prepared to write and be ready to allow your creativity to flow. It will be your "special" place to work.
You may also want to play a certain kind of music when you write. Sometimes music can get you into a particular mind set. Try creating a CD filled with "writing music". This music should be something calm, relaxing and uplifting.
Trying these new techniques may just push you into the next phase of your writing career!