On light to moderate doses i've found ego-loss to be quite subtle, killing me softly if you will... i find that to elicit release at these doses usually involves a practice that sensitizes one to the substance like meditation/contemplation, laying down with eyes closed, listening to music can help and even dancing, on even really low doses it's possible to come to the point where one is in a deep state of surrender/openess yet there is still consciousness, a body, and some semblence of identity.
On higher doses i find it's much the same just much more forceful, so whether i consciously meditate or not it's usually going to happen, if i don't distract myself and meditate then it can come to the point where i lose all physical reference of self and even lose consciousness itself... i do feel that it's possible to go just as deep with much lower doses it just takes more sensitization/deeper meditation

Once full boundary dissolution takes effect for me, the subject-object, inside-outside, perceiver-perceived, me-outside world drops itself into one endless moment of ineffability, no words, no jostling for dualistic descriptors of any sort; strictly and fully ONE; and in this moment the 'Me', the "I" is fully dissolute and any potential thoughts that I might typically have are instantaneously and effortlessly absorbed ad infinitum. Consensus reality is effortlessly replaced by 'That", me included. No more experiencer, ..just the experience. The experience that is experiencing itself.

Ime, through full boundary dissolution , full bore ego-death occurs; nothing left in tact aside from The Mystery itself.

"Soft" Ego Death seems to happen more frequently at lower doses, and it's a sense that, while the experiencer is still having a 1st hand experience of existing, all the mental associations they have about themselves (their name, history, self-concept, etc), have been shed, leaving some kind of pure 'self.' That self, however, is still self-aware, and still understands itself as something different from the outside world (i.e. it can draw the distinction between that which is it, and that which is not it).

"Hard" Ego Death is something that I've only seen described at high doses [think LSD thumbprints], and that gets described as a total breakdown of the boundaries between the 'self' and the 'the universe.' It becomes impossible to distinguish where one ends and the universe begins. The internal monologue and subjective experience of being 'I' ends. This seems closer to the transcendental states described by early mystics in their writings on religious experience, while "Soft" Ego Death is more psychoanalytical or cognitive. "Soft" Ego death occurs in all cases of "Hard" ego death, but not vise versa. "Hard" ego death is almost like loosing consciousness, and more prone to descriptions such as "union," "becoming one with," or "God."