The way the maha-mantra works is a science. The proper way to chant is to set aside our internal thoughts. Our mind is always being pulled here and there by something. But the chanting process is easy because we simply concentrate on the mantra. However, our meditation on the mantra will be most effective if we can avoid the internal dialogue always playing in our mind. It is best to not be chanting while we make plans for the day, or while focusing our attention on other things, politics, money, relationships, or health. The process is to simply chant and hear the spiritual vibration. That is all. If we can do that, then we will make rapid progress in self-realization.
To begin progressing on the path of chanting the maha-mantra, it is prescribed that the practitioner chant on beads called japa-mala, like a rosary, that consists of 108 beads with one extra head bead, which is larger than the others. Japa beads are available at the Prabhupada Village Gift Store.  One chants the Hare Krishna mantra once on each bead from the head bead all the way around the 108 beads. This is one round, or one mala. Then without chanting on the Krishna bead, turn the beads around in your hand and go in the opposite direction and chant another round. One should try to set a certain amount of time aside each day, preferably in the morning, and peacefully sit down or walk and chant the number of rounds you have set for yourself. One may chant two rounds, four rounds, or whatever one can do.