There is a growing strand of work on qualitative 'insider' research on migration and mobility, e.g. where migrants who have become researchers interview either other migrants from the same country of origin, or return to their country of origin to do research there. This kind of insider research involves particular methodological conditions, especially when it means studying 'sideways', where the power relations are negotiated in complex ways (e.g. Farahani, 2007; Voloder and Kirpitchenko, 2014; see also Ganga and Scott, 2006; Temple and Koterba, 2009; Ghorashi and Moghissi, 2010). In this chapter, I use two sets of extensive, narrative interviews with highly skilled Polish professionals to discuss certain methodological issues that arise in 'sideways migrant interviewing', e.g. interviewing both as a migrant and interviewing people of similar socio-cultural status as myself. The interviews in question were a) migrant-to-'non-migrant' interviews in Poland in the late 1990s; and b) diasporic migrant-to-migrant interviews in Sweden in the early 2010s. I discuss how the researcher may use her biographical experiences as a tool both in collecting data and for gaining a deeper understanding of the issues to be investigated, and how her shifting positioning may be used to secure and enrich data.