The potential of inclusive research has been indicated in many studies. Yet, it is almost unknown in Poland. A group of researchers from two academic centers invited people with Intellectual Disabilities (ID) to participate in a study. The study aimed to undertake inclusive research projects relevant to persons with ID. Prospective co-researchers with ID were offered training focused on issues related to scientific research and improving social skills necessary for playing various roles, including those of self-advocates. A qualitative, interpretive phenomenological analysis was used to explore the co-researchers’ experiences related to the training. Four main themes emerged: 1) circumstances associated with joining the training, 2) benefits of the training, 3) challenges as a researcher, and 4) training needs. The potential of the training was significant both in terms of expanding the psychosocial skills of co-researchers and integrating the group. The data confirmed the usefulness of the training in terms of preparation for the role of a co-researcher and increasing life skills critical in other areas of social life.