My best suggestion is to "shut down" your external stimuli for half an hour sometime. Set an alarm first, but then turn off the phone, computers, TVs. All of it. And don't interact with any other people or read anything during this half hour either.

Feel free to walk around, interact with physical things, do whatever you want.

If you get bored, just note the fact that you're bored, but don't dwell on it. Just be aware of whatever runs through your head, make a note of it, and then after the half hour is up - try to recall as much of what you thought about as possible.

That experiment, is in essence, meditation. And the act of recognizing what your thoughts and being able to recall those thoughts after the fact is 'mindfulness'.

It isn't some panacea it's just a mental state. Much like anger, or joy, or frustration. Mindfulness is simply a "meta" mental state; it's the mental state of recognizing other mental states.