Background <p>The need for a family-based treatment for children with trauma led to the implementation of Dyadic Developmental Psychotherapy (DDP) at Child and Adolescent Mental Health Services (CAMHS) and Child Welfare Services (CWS) in Norway. This study aimed to explore clinicians’ experience with the implementation of DDP.</p> Methodology <p>Participants (<i>N</i> = 25) were followed over three years with serial focus group interviews analyzed with systematic text condensation. The data were analyzed both cross-sectionally and longitudinally, allowing for the identification of central themes both across and between groups over time.</p> Results <p>All the participants expressed similar initial challenges: lack of support, role clashes, the complexity of the intervention, strong feelings in the sessions, and challenges with finding the right patient. However, the implementation process unfolded into three distinct pathways, regardless of workplace (1) “It resonates with me” – where highly motivated participants reached proficiency and flexibility. (2) “Then I feel like a DDP’er after all!” – where participants with positive impressions of the intervention continued using it with the help of workplace support and leadership, and (3) “We can’t do this alone.” – where participants dropped out owing to lack of support or motivation. The personal significance that participants in pathway one attached to the intervention appeared to facilitate the implementation process. These participants expressed less need for external support and structure and were able to adapt the intervention to a variety of settings and clients.</p> Conclusion <p>Allowing clinicians to train in interventions that are meaningful to them may facilitate implementation and positively influence patient outcomes.</p>