Students who recently finished a postgraduate course are in the best position to support other students navigating these courses. A scheme facilitating this has been offered at the University of Southampton since 2010. The mentor scheme allows MSc students to access support from alumni of their courses. In this talk, we will discuss our experience with involving students in the co-creation of a supportive learning environment. We share best practice and recommendations based on evidence collected in the course of the scheme. In particular, we discuss recruitment, the roles and responsibilities involved, and the scaffolding of mentor meetings.