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I've been a pretty severe nail-picker for a long time, have been in therapy a lot (and currently seeing a CBT), and have done some short exchange sessions with other pickers. Basically involves communicating info to the other person ("How strong are the urges to pick right now, on a 1-10 scale?") and that kind of thing. I've found it helfpful for my recovery. (I'm getting considerably better over time, but occasionally relapse, and need consistent "reminders" about the issue...) I don't have a lot of time for this, but would like to find someone who is interested in trying this out?