As promised, I would not like to go into detailed terminology, to remain to practical experience. As soon as one is following a spiritual path, one begins by itself to search for the deepening literature. Or one is led to all that what is needed.
The goal of entering Nirvana is bliss, perfect peace, realization of the cosmic expanse, oneness with the Divine Spirit. You also have to endure spiritual purifications, but you will literally fly higher, everything becomes ever more loving, blissful, peaceful. You are raptured from the world and its painful laws, what is perceived as pleasant, not only by yourself but also by the environment. You are bathing in the white peaceful consciousness that surrounds that person.
Most of those who reached this state renounced the material world, which they described as unreal, and sooner or later they abandoned their bodies. Ramana Maharshi, for example, died of cancer on his arm. He himself described the whole body as a single disease.
In the supramental transformation, the deification extends to all areas that make up our humanity: Mental, Vital, body-consciousness. Even in the smallest atom, divine consciousness is hidden dormant, which is now released again. The power that accomplishes this is called "Supramental Consciousness." For this purpose, Sri Aurobindo anchored it in the earthly atmosphere, and there it has been doing its work permanently since decades. And it will continue until the goal is reached. Once the contact between our psychic being and the supramental force is established, the transformation is taken over for us and we are protected on this not completely safe path. Therefore, the first goal should be to connect ourselves as soon as possible with our psychic being.
The path from top to bottom through the body is typical for the influence of the new consciousness, in order to open the lower chakras (areas of the lower nature) only at the end. Otherwise, at the outset, we would be flooded with all the rubbish from the subconscious, which is hard to handle.
To other people, one becomes more and more authentic, sometimes even uncomfortable, because the truth awareness sometimes intervenes spontaneously and forces you to express things other people cannot deal with. Every kind of untruthfulness, whether in the words of others or in their own body, causes increasingly discomfort in ourselves. One feels the true motivation behind the words of the conversation partner, who are often in conflict with the real motivations. It is the body itself that feels and reacts accordingly. One cannot avoid this and has to learn how to deal with.
Room for own experiences, comments, questions ...