The authors evaluated the effectiveness of a brief training intervention with graduate counseling students who used the HIRE (history, interest in change, reasons for engaging in the behavior, and exposure to risk; Buser & Buser, 2013b) model for the informal assessment of nonsuicidal self-injury. The intervention group demonstrated improvements in nonsuicidal assessment self-efficacy and assessment skill. Findings suggest that HIRE is an evidence-informed model for teaching nonsuicidal self-injury assessment.