Jayapataka Swami: You see, first before we chant the Maha Mantra, we chant the Panca Tattva mantra. And after that Hare Krsna! Now if the mind wanders away, we can keep some picture of Krsna and focus on that to bring the mind back. Also you can time yourself to see how long you take to chant. If your mind wanders off, you can also change the tune. One way or other you can bring the mind back. And after a while your mind gets purified and then you can chant more and more. Hare Krsna!