I had a hard time being convinced by the usual 2/3-pagers that tell you CBT will change your life and then going straight to "just close your eyes and breathe and focus on your nose". It irks me to be told what to do and not why. If your brain works like mine then this suggestion might be useful, otherwise probably not so much.
I found a used version of Mindfulness and Psychotherapy[1], which is designed as an introduction and contextualization of mindfulness, aimed at therapists. Because of that, it gives more details and helped me see behind the curtain, which is what a lot of therapists don't think about sharing.
An example of that: early on, there is a discussion between the usage of "client" versus "patient" to refer to the people therapists will help (which would be you), and their choice of using "patient" - as it means "one who bears suffering" -, instead of client - which means "one who puts themselves under the protection of a patron -, holds the implication the therapists are there to alleviate suffering.
[1] https://www.amazon.com/Mindfulness-Psychotherapy-Second-Chri...