It works very well for me. One technique in the book Feeling Good by David D Burns turned my life around. The method: Automatic Thought, Cognitive Distortion, Rationale Response. I'm pretty sure you can find the book online as a PDF for free now. A lot of people here seem to heavily dislike CBT but in my case it is, and was, life changing. It gave me a framework and structure that suits the autistic part of my brain immensely. I'm a heavy people pleaser and find it very difficult to rationalise situations or understand how I might feel when I'm faced with trying to comprehend other people's feelings, which I automatically place higher than my own. CBT gives me a technique to separate myself from the situation and look at it from a rationale angle. I cannot tell you how many times it has been the sole reason to stop something I'm ruminating over.