This is certainly something you could do, but it would not have quite the same u201cpunchu201d as filling the sheets out along with attending regular therapy sessions.In regards to DBT in particular, I believe that it depends largely on your level of self-awareness and how severe your BPD symptoms are. Sometimes it is incredibly difficult to get to see someone who specializes or is experienced with DBT, so I can see attempting the exercises on your own in tandem with CBT as being helpful, at least until you can get in DBT sessions.In my case, since my BPD is more u201cmildu201d and I had been in therapy for a long time prior to my BPD diagnosis for my depression and anxiety, my therapist and I found that I had already been implementing a lot of DBT techniques already on my own, which made the process a bit easier for me. I didn't have to teach myself an entirely new way of thinking, but rather just enforce and build upon much of what was already there to better manage my emotional deregulation in times of extreme stress.That being said, going through DBT with my therapist was still much more helpful than anything I could have done on my own. It helped me realize that I wasnu2019t far from the right path, and it really helped me improve my coping skills and mindfulness. It took me from a novice, to an intermediate, and will continue until I am an expert.I absolutely reccommend that you explore DBT and CBT on your own and learn all you can because it is extremely helpful. However, itu2019s not a substitute for a therapist. Ideally you want both.