For reaching state of self realization kundalini awakening in full is an absolute must. Full kundalini awakening results in full activation of brain. One immediately becomes knower of all. All dross impurities within soul atman, removes forever.
Normal human beings used their brain 1 to 2% whereas self realized souls used their brain 100%. Activation of brain from 2% to 100% is what self realization all about. For a self realized soul bookish knowledge now meant nothing. One can draw entire wisdom contained in cosmos directly from reservoir of mind plus. One finally becomes a bodhi, a Jina a Mahavira forever.
The mind power of a self realized soul reaches infinity. One can now develop communion with God Almighty every second of life on one-to-one basis.
For full kundalini awakening foremost of all is practice of absolute celibacy for a minimum period of 12 years in continuation. Not a single lapse is permitted! 12 years practice of absolute celibacy in continuation results in kundalini energy going from one chakra to another and reaching crown chakra, also called Ajna chakra.
At that moment Sahasra Pushpa (thousand petalled Lotus) existing in our brain behind forehead opens fully. Brain fully activated means in absence of dross impurities within the need for soul atman to further manifest a human body ceases to exist. One whose brain has fully activated can leave the mortal frame to reach state of moksha salvation.
One finally liberates from cycle of birth and death forever entering kingdom of God (Vaikuntha in Hinduism).
For human beings to realize self, full kundalini awakening is one of the most important aspects of spiritual path. There were many other attributes of spirituality that needs practicing like establishing total control over ego, demolishing it in totality. This helps a seeker establish contact with Lord Krishna existing in our heart as soul atman.
Metaphorically Lord Krishna is soul atman existing in our heart. When we demolished our ego in totality, we start getting promptings from Lord Krishna every now and then. Guided by promptings of Lord Krishna a seeker can successfully cover spiritual journey to reach the state of self realization, god realization.