I haven't experienced fear. It's more the difficulty of examining consciousness with consciousness, trying to be aware of being aware.
The trying is futile. One is aware. The attempt to understand or analyse awareness blocks the profound peace, and the siddhis.
In our culture we overvalue the analytical mind, IMO.
There are 75 trillion cells comprising a human body. Of these, only 100 billion or so are brain cells (some estimates say 200 billion) - maybe one fiftieth of our body cells.
There is an assumption that only brain cells are involved in awareness. I doubt that.
And of the brain cells, only half constitute the neuronal system. The other half is the glial brain, about which we know nothing much yet compared to our knowledge of the neuronal system.
And of the brain, only a portion (unknown) is involved in the process known as conscious thought.
So only a tiny fraction of the whole body performs the function we generally call self, or recognise as mind.
This tiny portion is generally the whole focus of our attention - and is the part which is involved in 'trying to understand '.
In my experience, and practice, that aspect of ourself is what is 'renounced', left like shoes at the door of the meditation room, if we wish to move beyond the limiting factor of ego.
We demand an understanding in the terms of this tiny subset of our whole self, and this blocks the experience of whole-body-wisdom, which does not function as discursive thought.
I think this is also what Gautama was addressing when he talked of the aggregates, and that they are not self.
This miniscule fraction of the whole experience more or less hijacks the flow of mind, most of which is not within the purview of this ego process.