To what extent and in what ways should a teacher educator contribute to a type of teaching development that has long functioned successfully without much involvement of teacher educators? This self-study concerns my learning about my role as teacher educator in a learning study, a Hong Kong adaptation of a teacher-driven Japanese educational and cultural practice, Jugyou Kenkyu, credited with high quality learning outcomes for both teachers and students. My first learning study case forms the retrospective backdrop to the self-study.