I think it is actually healthy, ethical and effective to always explain your training and areas of competence as part of informed consent in any context. Being a "psychologist" covers multiple skills sets and doesn't inevitably include being a "psychotherapist", so it seems to me graduate students (and beyond) should be encouraged to start honing their "elevator" speech (how you describe what you do when asked in an elevator...and short enough to deliver before reaching your floor..
