As a philosopher, you define constraints for any good theory explaining what you are interested in, then you go out and search for help in other disciplines.

For a human being, to possess a consciously experienced first-person perspective means to have acquired a very specific functional profile and distinctive level of representational content in one's currently active phenomenal self-model: It has, episodically, become a dynamic inner model of a knowing self.

The Ego is a transparent mental image: You, the physical person as a whole, look right through it. You do not see it. But you see with it.

At 19, I basically held the position that if you were intellectually honest and really wanted to get in touch with political reality then you had to smell tear-gas.

Subjectivity means to catch yourself in the act.

I believe that if we would carefully apply the distinction between transparency and opacity to the different layers of the human self-model, looking at self-consciousness in a much more careful and fine-grained manner, then we might also arrive at a new answer to your original question: What a "first-person perspective" really is.

The conscious experience of being a subject arises when a single organism learns to enslave itself.