@Abdulaziz said
"I guess I didn't phrase my question well, since what I read was probably on how or what it feels like to cross the abyss, on a personal level."
That's the difficulty in talking about it - in a sense, the "personal level" has to give way to (but also be included by) the "impersonal level". (It's easy to talk about it intellectually, if you're careful enough and have a bit of mystical experience - by talking about this, I don't mean to suggest I myself have attained that level.)
One way to think of it is maybe this: below the Abyss, you're a human being having "episodes" of realizing you are God; above the Abyss, you are God, having an "episode" of being a human being.
That's why the "leap" is scary, such a fundamental shift from personal consciousness to impersonal consciousness seems like "too much"; you are leaving behind every small comfort of being a mere human being, nestling in his warm burrow. As that creature, all you had to contend with were scary monsters in the dark. To have to contend with the fact that you are the One who is responsible for it all - that's a whole other level of terrifyingness.
And in fact, the fully-formed adult consciousness can't handle it, only the consciousness of a child can take it in its stride.