This chapter aims to help clinicians learn stabilization interventions for use in the Preparation Phase of eye movement desensitization and reprocessing (EMDR) treatment. Using these interventions will aid clients in developing readiness for processing trauma, learning how to manage symptoms of dissociation, dealing with affect regulation, and developing the necessary internal cohesion and resources to utilize the EMDR trauma-processing phase. Earlier negative experiences stored dysfunctionally increase vulnerability to anxiety disorders, depression, and other diagnoses. When assessing a client with a complex trauma history, clinicians need to view current symptoms of post-traumatic stress disorder (PTSD) or depression as reflections of the earlier traumas. The chapter outlines the strategies dealing with dissociative symptoms, ego state work, and internal stability that help clinicians to develop an individualized treatment plan to successfully guide the client through the EMDR phases of treatment.