PREPARING YOUR SPIRITUAL SPACE
Ideally, you should have a special space set aside for your personal work, with all your visionary tools collected there. As you meditate, work with your alter, practice your rune or tarot readings and scry in the same area, you build up a powerful energy which will help you reach a meditative state more easily the more you use it.
I have found that use of the same mellow instrumental music over time triggers an almost instant meditative state for me - my subconscious knows exactly what my intention is when I enter this area and put on the music. (One of my favorites is Kitaro's CD, "Tunhuang") Even though I'm a rock singer, I don't use rock for rituals - too distracting and I tend to sing along :-)
Incense has been used throughout history to help create a sacred space - and it's a delightful part of any ritual that sets the stage for psychic or visionary work.
If the area you choose for scrying has windows, be sure to keep the curtains closed for this work, as the sunlight or moonlight refractions from the window can be distracting. Candles are wonderful for all kinds of spiritual work, but any kind of soft lighting will do. I often use a small set of christmas lights for just the right amount of light without being too bright. Feel free to use whatever creates the best atmosphere for you. Many people prefer to scry at either dawn or sunset, although some traditions favor midnight and others favor high noon. Play with it! Experiment and see which times resonate best with you.
It is recommended that you create a special "spiritual circle" around the area in which you plan to scry. This gathers energy into your scrying area, as well as setting this portion of your home aside as special. Creating a circle can be as simple as turning in a circle and tracing it's shape around you with some incense, or acknowleging each of the four magnetic directions and speaking something such as "I now create the circle." I usually use a crystal wand for this purpose. Remain within the circle while you scry, and dissolve it with simple words or hand gestures when you have finished.