Meditation is like a single log of wood. Insight and investigation are one end of the log; calm and concentration are the other end. If you lift up the whole log, both sides come up at once. Which is concentration and which is insight? Just this mind.
Meditation is not something restricted to times of formal seated meditation; it is most fundamentally an attitude of being-a resting in and as being. Once you get the feel of it, you will be able to tune into it more and more often during your daily life. Eventually, in the state of liberation, meditation will simply become your natural condition.
In the Buddha's life story we see the three stages of practice: Morality comes first, then concentrated meditation, and then wisdom. And we see that the path takes time.
Make your meditation a continuous state of mind. A great worship is going on all the time, so nothing should be neglected or excluded from your constant meditative awareness.
In awareness there is no becoming, there is no end to be gained. There is silent observation without choice and condemnation, from which there comes understanding.
Walk, but make walking a meditation; walk knowingly Breathe, but let your breathing become a constant meditation; breathe knowingly. The breath going in: watch it. The breath going out: watch it. Eat, but eat with full awareness. Take a bite, chew it, but go on watching. Let the watcher be there in every moment, whatsoever you are doing.
The first thing to realize in meditation is that there is no authority, that the mind must be completely free to examine, to observe, to learn. And so there is no following, no accepting, no obedience.