I don't feel like showing your bird that "your the boss" is the way to go. I have had very few problems with my bird since I got her but from day 1 she was on my shoulder. She went through phases and needed behavior modification but nothing much. She just hangs out with me, doesn't do tricks doesn't really talk, just spends time with me.
The only problem she has recently is we moved out of my parents basement where she spent her entire life with me, now when I leave the room she screams. She did it a little before at my parents but it wasn't as noticeable when she was in my parents basement.
I have some experience with socializing a bird from when I was working at petco (where I got petrie).
We had a sun conure come in from another store because it wasn't selling, from what I heard it had really bonded to someone at that store and now it was in a new place away from the person it had bonded to. It wanted nothing to do with anyone and wouldn't let you get your hand near it, just bites.
Over time I slowly got it socialized, I would go in there every day just look at it and talk to it, then I moved to wiggling my finger outside the cage as if I was playing a game, then I would open the cage and do a "got you got you" kind of a game with my finger to peak it's interest as if I was playing a game (I was careful to keep my finger away from the beak, moving it away and keeping a distance to avoid a bite while keeping it a playful moment). Eventually that game made the bird want to grab my hand with it's foot out of curiosity and playfulness. That was how I got it to step up. I went from there and eventually got it fully socialized with me. I slowly backed off from the bird not wanting to overbond and without saying anything another employee bonded with the bird and took it out every night while working in the bird room. Was a proud moment for me to see the bird hopping from perch's to him and vice versa. (it wasn't long after that when he/she found a home)
Your bird has never been handled so your process will be different. It was still attached to someone at the breeders even though it didn't get out of the cage. I guess my point is with enough time and patience you will learn how to do it properly.
This must be very confusing for the bird, it's excited to be handled but scared at the same time. Unfortunatley both emotions produce biting in birds and it's probably both for it.
When my bird is excited that energy transfers to her beak.
Patience love and attention to whats working is what you need.