Question: I was wondering if it is possible to achieve self-realization by meditating with the mantra Baba Nam Kevalam alone, or is more needed?
Many years ago our Guru, Shrii Shrii Anandamurti answered this question directly. He said that “In meditation there must always be the feeling that you want to serve Him. If this is the feeling, immediately the mind gets concentrated. If in meditation there is the culmination of service, everything will be achieved. Even through the preliminary lessons of meditation a spiritual aspirant can get salvation, but even one practicing higher meditation cannot attain it if there is no feeling of service.”
So, if your approach is correct you can get liberation with the simplest form of meditation. However, whenever possible it is also good to learn more advanced lessons of meditation because they will help you in your practice.