No step-by-step instructions necessary, just watch the movie. You will hear them repeatedly refer to Jim Carey's malady as schizophrenia while he shows characteristics for an entirely different disorder-- Disassociative Identity Disorder (aka Multiple Personality Disorder). They are two completely different things! Apparently the writer, director, producer, and every other person working on this movie failed to look up the term they were using as a basis for the movie.