BackgroundSupported self‐management can improve clinical and psychosocial outcomes in people with cancer; the considerations required to implement self‐management support (SMS) for people living with a lower‐grade glioma (LGG)—who often have complex support needs—are not known. We aimed to identify and understand these implementation considerations through the lens of normalisation process theory (NPT), from the perspectives of healthcare professionals (HCP) and people with LGG.MethodsWe conducted semistructured interviews with HCPs who support adults with brain tumours (n = 25; 12 different healthcare professions), and people with LGG who had completed primary treatment (n = 28; male n = 16, mean age 54.6 years, mean time since diagnosis 8.7 years), from across the United Kingdom. Interviews were transcribed and inductive open coding conducted, before deductively mapping to constructs of NPT. We first mapped HCP data, then integrated data from people with LGG to explore alignment in experiences and perspectives.ResultsWe generated supporting evidence for all four NPT constructs and related subconstructs, namely: ‘Coherence’, ‘Cognitive participation’, ‘Collective action’ and ‘Reflexive monitoring’. Data from HCPs and people with LGG clearly demonstrated that effective SMS constitutes a collective activity. Key implementation considerations included: ensuring awareness of, and access to, support; building strong HCP‐support recipient relationships; and careful inclusion of close family and friends. We identified pertinent challenges, such as identifying support needs (influenced by the extent to which those with LGG engage in help‐seeking), resistance to support (e.g., technology literacy), training for HCPs and HCP cooperation.ConclusionsThis study demonstrates the collective nature of, and provides insight into the individual roles within, supported self‐management. We outline considerations to operationalise, sustain and appraise the implementation of SMS for people with LGG.Patient or Public ContributionPeople with brain tumours, and informal caregivers, were involved in the development of information materials and topic guides to ensure accessibility and pertinence. They also had opportunities to comment on interview findings.