This paper seeks to contribute to a users’ guide to decolonizing behavioural science by using an autoethnographic lens to focus on the complex struggle of undoing the practitioners’ lingering colonialities. Autoethnography is self-reflexive research that interrogates the researchers’ own experiences. It involves using personal experiences to understand social phenomena, and it has been described as an important tool in bringing visibility to col-oniality (Hernandez-Carrazana et al., 2021). We use the term lingering col-onialities, to describe a rigidity to change and blockades to radical, critical actions (Williams, 2016) even among those who aim to practice decolonial methodology.