Mindfulness is such a helpful and essential tool in your DBT work. It's so important to practice mindfulness in your daily life. Getting started with anything new that isn't your norm can be difficult. As a person with ADHD and C-PTSD, I know that feeling very well.
An excellent way to look at it is like a "check-in" on yourself throughout the day. It makes you stop and take note of your current situation and your physical and emotional response to it. There are a few ways to do this, and you need to find what's best for you.