Eye Movement Desensitization and Reprocessing (EMDR) is a powerful therapeutic approach. However, without the proper training and consultation, an untrained clinician (and this includes very experienced clinicians) could put their clients at risk. This Primer’s goal is to target those clinicians who have completed the EMDR therapy two-part basic training, 10 hours of supervised consultation, and have read Dr. Shapiro’s basic text (Eye Movement Desensitization and Reprocessing: Basic Principles, Protocols, and Procedures, 3rd ed.) and Getting Past Your Past, but still want additional information on using it skillfully. The Primer will encourage and raise the confidence levels of those trained but wanting to increase their ability to use EMDR therapy with consistent success. The primary intention of the Primer is to supplement Dr. Shapiro’s explanation of EMDR therapy. It is not meant to be a substitute for her training or previous writings. The reader is urged to read and study them all. The book adds case histories and extensive examples of successful EMDR reprocessing sessions. The cases represent composite or conglomerate portraits of the many clients with whom the author has utilized EMDR therapy over the past 20 years. The text is a Primer and presents the writing, examples, and illustrations in a less formal and more personal manner. The Primer has been written from a practical, learning-focused approach so that the clinicians who read it can become more familiar with the principles, protocols, and procedures of EMDR therapy. An attempt is made to take the clinician through complete and incomplete EMDR therapy sessions, explaining treatment rationale at given points. The book offers a Primer that can facilitate the process of mental health professionals becoming more confident and experienced clinicians in EMDR therapy. The process has been simplified as much as possible with diagrams, tables, and other illustrations.