Trichotillomania (TTM), repetitive pulling out of one's own hair to the extent that noticeable hair loss occurs, is a distressing condition interfering substantially with functioning and quality of life. The longterm objective of this research is to determine whether psychological treatment of TTM could be disseminated more effectively by using a stepped care model in which less intensive interventions are tried first, with more intensive interventions used only if initial treatment proves insufficient. This project is a pilot study of the first two steps in a stepped care model of treatment. After baseline assessment, 50 participants with TTM will be randomly assigned to (a) Immediate condition, in which they are offered 10-week self-help treatment via an interactive website (Step 1) or (b) Wait List/Delayed Start condition, a 10-week wait list prior to being offered Step 1. In each condition, at the end of Step 1, participants will be offered 8 weeks of in-person habit reversal training provided by psychology graduate students (Step 2). TTM symptoms will be measured from baseline through a follow-up 3 months after the end of Step 2, as will depression, anxiety, quality of life, functional impairment , treatment utilization, and treatment satisfaction.