I would set small goals for yourself for mindfulness. It really does take practice. For example, maybe start with just one minute of meditation. Some of the exercises I learned in DBT were to practice eating food mindfully. Also, practice being mindful while watching waves on a beach on YouTube (unless you live near a beach lol) or something else relaxing. Just don't expect too much of yourself. It's natural for your mind to wander and you really have to build up to being able to be mindful and meditate for long periods of time.

I also found some mindfulness meditations on YouTube and iTunes that I listen to when I can't sleep.