Every time you glimpse freedom, your level of awareness heightens by just a little, and when repeated over and over again the light of consciousness starts to gain more and more momentum. It will be difficult at first, but once your level of awareness reaches a certain tipping point, characterized mainly by your outlook having become predominantly positive, your practice will become easy, playful, and almost effortless.
At times you will experience giant leaps forward, for example after having just gone through a great deal of suffering, but most of the time it is a matter of patiently repeating your practice and heightening your level of consciousness in small steps. And this, as I see it, is the true practical value of meditation, because even if you only have 15 minutes of peaceful introspection in a day otherwise filled with noise and activity, your awareness will gradually become higher and higher as you go along.
Just 15 minutes a day will make all the difference. Of course, what is necessary is that we don't give up.