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Introduction: Total breast reconstruction with autologous fat transfer (AFT) is a relatively new breast reconstruction method. Although AFT was predominantly used to correct postsurgical defects, the surgical skills of a total breast reconstruction with AFT are different and can be facilitated for novices to accelerate their learning process. This study aims to assess the learning curve of plastic surgeons in total breast reconstruction with AFT in the Netherlands., Methods: A mixed-methods study was performed based on the multicenter randomized clinical BREAST trial data. For the qualitative analysis, semistructured interviews were conducted. To test hypotheses derived from the qualitative data, retrospective data analysis was performed using multilevel linear regression analysis of the patients undergoing AFT as a total breast reconstruction method., Results: The interviews revealed that plastic surgeons need to perform the procedure several times to learn and experience the technical details of total breast reconstruction with AFT. Learning and improving this technique works best by scrubbing in with an expert. Before plastic surgeons learn the optimal volume of fat reinjection over time, they tend to inject too little fat and subsequently too much fat over multiple procedures. With more experience, the rigottomy technique becomes more important. Besides technical details, managing patient expectations before starting treatment is paramount. Multilevel linear regression revealed a significant decrease ( P < 0.001) in the number of surgical procedures and the total injected volume ( P = 0.002) to complete a total breast reconstruction with AFT., Conclusions: This is the first study that explores the learning curve involved in using AFT as a total breast reconstruction method. The feeling of when fat transfer is sufficient, and how to release scars for a good result without causing seromas, is best learned by scrubbing in with experienced colleagues during several procedures, interchanged with starting one's own practice., Competing Interests: The authors have declared they have no conflicts of interest., (Copyright © 2024 Wolters Kluwer Health, Inc. All rights reserved.)