In Argentina, Chile and Ecuador, abortion at later durations of pregnancy is legally restricted. Feminist collectives in these contexts support people through self-managed medical abortion outside the healthcare system. The model of in-person abortion accompaniment represents an opportunity to examine a self-care practice that challenges and reimagines abortion provision. We formed a collaborative partnership built on a commitment to shared power and decision-making between researchers and partners. We conducted 28 key informant interviews with accompaniers in Argentina, Chile and Ecuador in 2019 about their model of in-person abortion accompaniment at later durations of pregnancy. We iteratively coded transcripts using a thematic analysis approach. Accompaniers premised their work in a feminist activist framework that understands accompaniment as addressing inequalities and expanding rights, especially for the historically marginalised. Through a detailed description of the process of in-person accompaniment, we show that the model, including the logistical considerations and security mechanisms put in place to ensure favourable abortion outcomes, emphasises peer-to-peer provision of supportive physical and emotional care of the accompanied person. In this way, it represents supported self-care through which individuals are centred as the protagonists of their own abortion, while being accompanied by feminist peers. This model of supported self-care challenges the idea that "self-care" necessarily means "solo care", or care that happens alone. The model's focus on peer-to-peer transfer of knowledge, providing emotional support, and centring the accompanied person not only expands access to abortion, but represents person-centred practices that could be scaled and replicated across contexts.