This guide develops a psychoeducational intervention that was prepared and implemented in the university environment, and its main objective is the modification of dysfunctional beliefs linked to perfectionism in students. It contains theoretical approaches framed in contemporary Psychology and more specifically in developments in Cognitive Behavioral Therapy, as well as practical exercises aimed at the identification of dysfunctional cognitive and behavioral patterns and the active search for change. It is presented as a valuable and unprecedented tool in our environment for the promotion of healthy habits and behaviors, with the possibility of being applied in various areas and to different problems associated with the presence of perfectionist beliefs. It begins with an introduction to perfectionism, its positive and negative, or adaptive and maladaptive dimensions, and its development associated with cultural beliefs and mandates. The characteristic pattern of perfectionist thinking is exposed in order to identify it by means of a specific tool and thus subsequently modify the dysfunctional pattern of this thought. Perfectionist behaviors, their implications, and the impact they have on interpersonal bonds are also addressed.