DBT is a type of therapy that was originally created specifically for those with Borderline Personality Disorder. If you google DBT (dialectical behavioral therapy) and Marsha Linehan (she is the ph.d that created it.) you will get a lot of information. There are different modules to the the therapy but the ones I am familiar with so far (from my DBT class) are Mindfulness and Emotion Regulation. Mindfulness teaches how to stay in the present moment and being in a "solution" state of mind. I have found that a lot of my struggles are about anxiety of what "might happen" (which is living in the future) and what did happen (living in the past.) Emotion regulation teaches skills to help when our emotions turn extreme in a quick moment. I am learning how to recognize what leads up to those irrational behaviors (like cutting).
I don't think I could have started DBT without having at least a year of private therapy. First of all, the group setting would have been way overwhelming for me and also, i had to face my past traumas before i could learn to try to live in the present moment (mindfulness.)

Hope this isn't too much information. Just my experience so far with DBT.