I'm almost 1/2 way through DBT. I don't think it would help me at all without the therapists. And as much as I'm hating going at the moment - because my individual is leaving so I have anew one I don't like. Before all that it was really helping. I don't have the massive angry out bursts where I scream and break things. I haven't been in hospital for about 4 months which is the longest I've been out for. I think that the skills groups are good but the individual appts are key cuz it's there you put the skills you've learned in group into your life. And if something didn't go quite so well then you talk about it and see where the skills would have fitted to improve the outcome.
I've found DBT to be just about accepting things. It's based around the serenity prayer so we focus on this in group.

"grant me the serenity to accept the things I cannot change, the courage to change the things I can, and the wisdom to know the difference."