First of all, let's understand the term 'Enlightenment' in detail.
An example:
Suppose one asks you, “What is your name?” You will say, “My name is John(insert your name).”
So, are you John or is your name John? Your name is John.

Just like when you say, "These are my eyeglasses", you are actually separate from your glasses; similarly, when you say, “My name is John”, you are actually separate from your name.
So, who are you then?

Another example:
Suppose you own a shop named 'General Traders'.
It means you, the owner of the shop, and the name of the shop, 'General Traders' are separate, isn’t it? The name is just a means of identification. Yet, the belief that, "I am John" does not diminish even in sleep.
Whenever you superimpose 'I' where 'I' does not belong, that is a wrong belief. Enlightenment is to get the right belief of 'Who am I" and get rid of all the wrong beliefs.

One more example:
Suppose there is pain in your hand. So, you will say, "My hand is aching." You will not say, "I am aching", isn’t it? It means you are separate from your hand; you are separate from your entire body.
Similarly, we say my home, my things, my children, my wife, my watch, my mind, my intellect, my ego and so on. Who is this saying ‘My’?
If you keep on deducting 'My' from 'I', then what will remain?
The 'I'.
That 'I', is precisely what you are.
Realizing that 'I' is 'Enlightenment'.

But can we separate 'I' and 'My' by ourselves? No!
For example
If we are bound to a pillar with ropes, can we cut the strings by ourselves? No, we need the help of the one who is free (not bound). Such a person can cut our ties and make us free too.

Another example
There is a gold ring. Will we be able to separate the gold from the copper herein? No. Only a goldsmith can do it, because he knows the qualities of both these elements.

The second step to attain enlightenment therefore is to find the One who is enlightened and has the power to enlighten us.
Gnani Purush (the Enlightened one) knows the qualities of the Self (I) and the non-self (all which comes under 'My'). Therefore, he can separate the two. This is called 'Bhed Gnan', the science of separation.

Gnan vidhi is such an enlightenment process where Gnani, through his spiritual powers, is able to separate the Self from the non-Self of everyone who comes to Him seeking the Science of separation (Bhed Vignan), in just two hours. During Gnan vidhi, our deluding karma are destroyed by the Gnani and thus one attains Self-Realization. Thereafter, the awareness of the real Self (the real ‘I’) never leaves. In this experience of the Self is the destruction of the experience that 'I am the body'. When the experience that 'I am this body' goes, new karma ceases to bind you. So, first comes the freedom from ignorance of the Self, then comes the final liberation within a couple of lifetimes.

Param Pujya Dada Bhagwan is the founder of the Akram path.
In June 1958, a phenomenal spiritual revelation of Self-knowledge naturally occurred within Ambalal Muljibhai Patel. At the end of this spontaneous internal Self-enlightenment, which took about forty-eight minutes, He became Gnani Purush Param Pujya Dada Bhagwan. Dada Bhagwan (meaning the fully enlightened Self) had manifested within Him. His words became the foundation for the new, direct, and step-less path to Self-Realization called Akram Vignan. Just as a lit candle can light another candle, this Self-knowledge can be acquired by meeting a Gnani.

Gnani Purush Dada Bhagwan said,
"I am simply instrumental (nimit) in showing you this path or pointing you in the right direction. My intention is only this: May you attain the bliss that I have attained. Such a magnificent Vignan that manifested will not be buried without its full purpose coming into reality. I will leave behind me a generation of Gnanis. So look for a living Gnani Purush. There can be no solution without one."

The link of Akram Gnanis now continues with the current spiritual master Pujya Deepak Bhai Desai, whom Pujya Dadashri graced with special siddhis to continue to bring the Atma Gnan and Akram Vignan to the entire world. Pujya Deepak Bhai was further molded and trained by Pujya Niruma, who blessed Him to conduct Gnani vidhi in 2003.

To know more: https://www.dadabhagwan.org/self-realization/

Author's Bio: 

Ambalal M. Patel was a civil contractor by profession. In June 1958, spontaneous Self-Realization occurred within Ambalal M. Patel. From this point on, Ambalal became a Gnani Purush, and the Lord that manifest within him became known as Dada Bhagwan. A Gnani Purush is One who has realized the Self and is able help others do the same. Param Pujya Dada Bhagwan used to go from town to town and country-to-country to give satsang (spiritual discourse) and impart the knowledge of the Self, as well as knowledge of harmonious worldly interactions to everyone who came to meet him. This spiritual science, known as Akram Vignan, is the step-less path to Self-realization.