Little research exists to help us understand why some beginning special education teachers of reading engage in more effective classroom practices than others. Factors that may influence these differences include personal attributes, preparation, and school environment. This mixed-methods study examined beginning special education teachers (N = 25) who taught reading to elementary students. Teachers were identified as most accomplished, moderately accomplished, and least accomplished, as defined by an overall classroom practice score. Interviews, observational field notes, and survey data on preparation and work environment revealed that the most accomplished beginners were consistently reflective, resourceful, and relentless and used these attributes to improve instruction, whereas others varied in this regard. Furthermore, while adequately prepared in special education, beginners reported inadequate preparation in reading. The interplay of personal attributes, preparation, and school environment seems to be a powerful determinant of a teacher's level of accomplishment. (Contains 1 table.)