Sources:
Kabat-Zinn J. Mindfulness Meditation: Health benefits of an ancient Buddhist practice. Mind/Body Medicine, eds. Goleman D, Gurin J. New York 1993. Consumer Reports Books, 259-275.
I have two of his books, and those are pretty good tips for mindful meditation. But mindfulness is not just during meditation but used at all times when we're not meditating, just trying to keep aware of our thoughts, actions and not be 'reactive' to everything. I find that it can be very difficult to not simply be reactive because of the nature of the subconscious mind. But the more we meditate, the more we can pull 'forth' whatever garbage we have stored in the subconscious self, and be made aware of it, so we can be mindful and not be 'reactive' people, but we make actions which are more thought out.