Interactive systems have become an integral part of our daily lives, influencing how we communicate, work, and play. Understanding the intricate relationship between humans and technology is at the core of Human-Computer Interaction (HCI) research and design. Amid the array of methodological tools available, first-person research methods have emerged as powerful instruments that enable researchers to delve deeply into the human-technology experience. Five years after the first edition of the Designing Interactive Systems (DIS) workshop on first-person methods, this full day workshop invites HCI researchers, practitioners, and enthusiasts to embark on a journey of discovery of their sample of one. Drawing inspiration from the rich tradition of autoethnography, autobiographical design, embodied ideation, and more, we aim to explore the omnipresence of technology in our everyday lives while acknowledging our own subjectivity and positionality in research and design.