Although foundational practice classes play a key role in helping prepracticum students develop counseling skills, we know little about the effectiveness of this form of helping skills training. This study assessed the effect of helping skills training delivered in foundational practice classes on proximal indicators of counseling skills acquisition, including measures of counseling self-efficacy, empathy, anxiety, and hindering self-awareness or rumination. Participating students made significant gains in counseling self-efficacy that were maintained at 3-month follow-up. Reductions in anxiety, rumination, and personal distress in interpersonally challenging situations were observed at follow-up, indicating that students made a successful transition to the field following training. The frequency of large-group role plays in particular was related to gains in students' counseling self-efficacy.