Some ways of talking about a nondual awakening...
It is the Ground of all phenomena that awakens to its own nature, while still functionally connected to a particular human self.
Allowing any and all phenomena
This Ground is that which already allows all phenomena to arise, to come and go, to live their own life. It allows - in no particular order - Hitler and Jesus, Buddha and GWB, pain and pleasure, equanimity and drama, repression and clear seeing, clouds and mountains, inanimate matter and life, seeing and seen, stars and galaxies, dark holes and nebulae, birth and death, cities and rain forests, Bach and Madonna, cars and bikes, confusion and clarity, delusion and realization, a sense of I and awakening as already selfless, beliefs and thoughts freed from beliefs, suffering and joy, arrogance and humility, any and all perspectives, justice and injustice, harming and helping, destruction and building up, war and peace, simplicity and complexity, and anything else that is happening, ever has happened, and ever will happen.
It allows all of this, inherently. It allows itself to be formed into any and all of these. It allows space to hold and take any and all of these forms. As Ground, there is no resistance to any of these, not even to resistance. It is all there, naturally, spontaneously, just happening, living their own lives.
Spiritual practice mimicking Ground
And in spiritual practice, we mimic this as well as we can.
We practice shikantaza, just sitting, allowing anything to come and go on its own, including resistance and holding onto something. We practice selflessness, acting in selfless ways, because that is our nature. We practice self-inquiry, looking at what is already true in immediate experience.
In all of these ways and many more, we prepare the ground for Ground to spontaneously awaken to its own nature.
Content stays the same, context shifts
In a nondual or Ground awakening, the content can stay the same. No change is needed in content. It is just the context that changes, from a sense of I to a realization of no I anywhere in all of this.
When the context shifts in this way, content does change as well as a consequence of this shift. This human self reorganizes and realigns to the new context, at all levels - from physically, energetically, emotionally and mentally, to how it lives its life. It needs time to reorganize, as Ground needs time to become familiar with operating through a specific human self in the context of realized selflessness.
There is a maturing at all levels after this awakening, and this includes exploring and developing skillful means, ways to live this through a human being and in the world.
Ground and human self
No human being awakens. It is the Ground that awakens to its own nature while functionally connected with a human self.
There is no human awareness, only the inherent awareness of Ground temporarily misidentifying itself as human or as the property of a human self.
When the center of gravity is in the human self, it sees itself as an object in the world, within time and space, subject to birth and death, at the mercy of emotions and beliefs, living from likes and dislikes. When Ground awakens to its own nature, allowing and as any and all phenomena arising, this human self just becomes a part of the landscape.
There is a seamless field of whatever is happening, this human self is a small part of this field, and there is no I anywhere. This human self and everything else lives its own life. There is just the doing there, and no doer to be found anywhere.