Automatic writing is one of the most difficult divination techniques. It falls into the area of motor automatism.
The mind derives information from supposed, spiritual or otherworldly sources, then takes control of the nerves and muscles in the arm and hand of the writer and delivers that information on paper.
Professional automatic writers are called autonographists.
In order to automatic write you must achieve an abstracted , receptive state of awareness. Do not focus on your hand or what is being written.
One of the most famous autonographists, Stainton Moses, used to receive automatic writing with his left and his right hand at the same time.
Some people may write without even realizing anything has happened.
Automatic writers have reported feelings of like electric shocks running down through the arm or the feeling as though someone is touching or holding their arm and/or hand to guide the writing.
At first the movement of the pencil may be just circles or lines. A tingling in your arm is a good sign.
Automatic writing is often hard to read and the words are often joined together. Sometimes the words are so small you will need a magnifying glass. Other times, the words are written upside down or in reverse.
Another form of automatic writing is when the practitioner hears words in the conscious mind and then writes them down.
This is how Aleister Crowley claimed to have received his work "The Book of the Law".