GRIS-Montreal « demystifies » sexual and gender diversity by mobilizing experiential knowledge through a biographical approach in order to deconstruct received ideas and stereotypes. Different issues of representation, representativeness and legitimacy mark the use of intimate experiences as an intervention method. This article presents the reflection developed when trans and non-binary experiences were added to the mission of GRIS, initially created to demystify only sexual orientation, on ethical sensitivity, methodological challenges and preferred narrative methods.