First, enlightenment cannot be achieved because it is the natural state which is present even now. Rather, it can be revealed if the obstructions are removed. Like someone pulling up the blind and realizing the light and warmth of the sun was always there. You do not achieve sunlight, you simply pull away the curtain. What is required is the devotion and intensity to have the obstructions removed.
There are numerous methods that can be employed; all of which are aimed at quieting the mind and strengthening the nervous system. Upon experimenting with these methods you will see that the mind once again starts back up and seems to “grow a new head.”
The methods and techniques do not completely remove the obstruction or the exclusive sense of “I,” whose material is made up of individual thought patterns that create a seemingly separate-self or sense of individuality; because techniques do not reveal the Source of techniques.
As a general practice one should make the effort to sit still and remain as an observer of the stimulus coming in through the senses and observe thoughts while asking oneself constantly, “who am I in spite of the these thoughts and body sensations?” This is the method of inquiry into the Source or Final Cause for the method and inquirer.
As you go deeper, techniques will be presented as a revelation and they will become a natural organic expression and will be custom tailored for that specific body and mind.