I’m in a DBT group right now. It’s comprised of four modules, and I just finished my second, which is distress tolerance. Of all the things I could possibly say about it, the most accurate would be that it’s a lot of work. Think of it this way: it’s a lot of practicing things that are aimed at reducing distress, regardless of what mood or state of mind one might be in. Thankfully my emotions are still pretty distressing on a regular basis, so I was able to more or less have something to compare the results to.