Hey Tay!
There's been lots of discussion on the aviator harness, so I suggest doing a search and reading those forums for lots of feedback info and views on the harness. There's no guarantee your bird will either love or hate the harness, and while a lot of it does come down to training there's no promise that a bird will like the harness despite being a hands-on bird. Generally, a bird that is comfortable with being touched all over, is well exposed, and has a very adventurous personality would very much so enjoy harnesses!
But it can take a LOT of training and preparation, or very little. It all depends on the bird and how much time you're willing to put into harness training every day. I would first work with getting your bird used to being handled enough to put the harness on (touching over the head, extending the wings, touching the chest, having them close their eyes), and then work on getting the bird used to being touched and being around the harness. Then, you can move onto trying to put it on.