Student employees at circulation desks are the first points of contact for many library users with research questions, but they are challenged to respond or refer when librarians are unavailable. In an attempt to cultivate student employees' reference skills, confidence, and connection to the library's values and mission, the Engineering and Physical Sciences Division of the UC Berkeley Library developed an outcomes-based training program consisting of an interactive session and a dynamic online reference manual. Student employees completed pre-training and post-training assessments of their reference skills and self-efficacy. Qualitative feedback was analyzed to identify ongoing challenges and intangible benefits for student employees engaged in reference work. Challenges observed include user expectations, infrequent questions, and the complex information landscape; benefits observed include community building and student growth. Implications of these challenges and benefits for student training programs are discussed.