Emotions and the emotional labour of researchers have been increasingly recognised in social science disciplines, with many researchers providing personal and reflexive accounts. Such debates are less well recognised in health-related disciplines, particularly public health, who remain at earlier stages of valuing and understanding qualitative research. Drawing on personal experiences and methodological reflections gathered from a qualitative study, undertaken with young people over the course of 16 months during the COVID-19 pandemic in England, UK, the aim of this article is to offer further insight into the impact of researcher emotion, by specifically focussing on longitudinal, diary-based methods. My reflections are framed as three overlapping and intersecting themes. First, that qualitative longitudinal methods (and diary studies in particular) have enormous potential to curate rich emotional narratives. Second, that despite these positives, there are tensions or conflicting dynamics in using a method which helps to explore young people’s emotions but also involves emotional labour for the researcher. Third, that greater attention should be paid to ensuring ethical care for researchers, particularly those engaging with qualitative longitudinal and/or creative methods. Such strategies should not solely rely on self-care and must be considered at institutional or funding body level. To this end, my personal experiences and reflections, as well as those from previous offerings, are used here to underpin a framework for researchers or research teams embarking upon novel qualitative longitudinal methods: 1. Do not underestimate emotional burden. 2. Ensure meaningful debriefing is available. 3. Establish boundaries. 4. Make space for emotion throughout fieldwork as well as during analysis and writing (‘entering and exiting the field’).