There is no such thing as a psychic, only people who call themselves such. It is a total fraud. Any magic shop will sell you a book on how to become one. Richard Webber, a woman named Rothschild, and a man named Nelson, are but a few of the authors.
Davenport's Magic Shop in London, is online. Look for publications on psychics, or cold reading, as it is properly called.
When fortune telling became a criminal act, these charlatans began calling themselves psychics. Why this scam is not illegal, I shall never know.