This chapter examines methodological considerations in researching migrant transnationalism, focusing on how scholars can embed transnational awareness into research designs. Recognising that no single approach fits all questions, it reviews diverse quantitative and qualitative methods from across disciplines. The chapter emphasizes the value of multi-sited fieldwork, while also acknowledging the insights that can arise from single-location studies. It critically reflects on how transnational research often centres either migrants or their non-migrant counterparts, often in origin or residence countries. A contribution is a practical toolkit that discusses reflexivity, positionality, interdisciplinarity, and ethics as these relate to knowledge co-creation in transnational social fields, and across global asymmetries. The chapter aims to support researchers and students in conducting nuanced and rigorous, transnationally conscientious research, and highlights the enduring value of a transnational lens in migration studies.