This study compared a sample of entry-level and advanced BSW students, who completed pretest and posttest self-efficacy measures, to assess their level of confidence in performing social work tasks after 15 weeks of instruction. By the end of the semester, only advanced students made significant gains in self-efficacy beliefs, and they showed a significantly higher self-efficacy belief than entry-level students. Results suggest that increased mastery experiences, as found in the advanced social work curriculum, may help students develop confidence in their ability to practice as professional social workers.