You say are "not able to concentrate," yet this is not the fundamental obstacle to being able to meditate. Acquiring comprehension does not depend on acquiring one-pointed concentration for an hour. Comprehension is simply a conscious understanding, which is the basis of liberation. Concentration helps, certainly, but it is not required absolutely.
Moreover, comprehension begins the instant you feel the impulse of the conscience. When you feel that a behavior was wrong, that is comprehension. It is not deep, but it is a start. So, comprehension is something we are always gathering, provided we are listening to the conscience.
Of course, by meditating, we go deeper. On this note, concentration helps, but it does not have to be 100% one-pointed. Even a few moments of consciously reviewing an event can be enough for your conscience to recognize what in it is wrong and what in it is right. So you see, meditation begins in a simple way, and is not difficult.
Eventually, by continual practice of this retrospective method (described in the lecture I recommended), with the combination of concentration, imagination, and drowsiness, you will suddenly find yourself in a dream like state, perceiving internally, but with awareness. In that state, one can go even deeper into the investigation of the event. Accessing this state is done in the same way that we take a nap or go to sleep, but with awareness. So, it is not difficult or impossible, it just takes a bit of balance and practice.
All along this process, one finds answers not through spectacular visions (although they might happen), but mostly through listening to the impulses of the conscience. That is called intuition.
Another lecture that might help:
http://gnosticteachings.org/courses/meditation-without-exertion/2409-comprehension-in-meditation.html