The best way to understand the meaning of Hare Krishna Mahamantra is to chant it endlessly.
Iron cuts iron and in the same way, nama or Hare Krishna Mahamantra manifests the real meaning of Hare Krishna Mahamantra. The very fact is that it is so simple. Anybody can do it at any time under any circumstance. Once somebody takes to nama and chants sincerely, everything comes from within.