Vicky
I was given an IRN because it was 'mean'. Well they weren't kididng ... BUT, I worked with her every day for almost 6 months, taking her into the bathroom (with the door closed and toilet closed) and letting her come out of her cage, then trying to handle her. I took some nips, but the only time she really BIT me was first time I tried to pick her up and she didn't know me.
It took SIX MONTHS working with her every day for 15 to 20 minutes in the bathroom (sometimes twice or three times a day!) chasing her around (she's flighted and no way was I gonna lose a finger trying to clip her wings!) before she trusted me enough to let me touch her.
An IRN is very similar to a moutached, similar coloring, similar size, similar personality, so it may be a LONG time before she trusts you. Realize no bird is an instant fix, instant lover like a puppy. Most take time to get to know you and most will still bite no matter HOW LONG you've had them

Good luck ... just know it will take patience.
It will take patience to get the bird to trust you, don't give up, it is worth it in the end
My IRN Nala doesn't speak at all But that's ok cuz she is my lover bird ... too much so sometimes ... none of the other fids can be on me without being attacked if Nala is out. She even goes after the cat!
They are VERY possessive, of people and their cages sometimes. I still have to be careful if she is in her cage when I change food and water ... she's been known to nail me when put the water dish in or out
She was a TERROR when I got her. It took 6 months, work-outs of up to an hour at a time in an enclosed space (bathroom) to finally convince her I am NOT the enemy - and a myriad of BIG BITES!
But now she is a lover! A JEALOUS lover, but in the last year (since she decided to play nice), I've only been bitten once when I startled her. She makes sure the rest of the fids stay off HER mom, tho ... including the CAT!!
Try here
IRN Forum for info on Indian Ring Necks. I belong to that forum as well and they've taught me a lot on how to handle Nala.
Her flock call is PIERCING!!! Luckily she doesn't do it often, morning to let me know she's awake, and at night to let me know it's bed time!!! But she is the one I will yell at the most if I don't cover her soon enough and she gets going!
It took Nala from February to October to decide she loves me ... used to take CHUNKS out of my arm with that big red beak ... but now she truly is a lover ... VERY possessive, VERY cage territorial, even when I change out her food/water ... but once out of her cage she IS a lover bird with me. Not friendly with other fids tho. She will attack, even the cats!
I love her, tho, and she loves me. Very independent sometimes, but still a beautiful bird.
Definitely not for the faint of heart (and those who want to keep ALL body parts attached!!) and not for those who want to keep their ears working ... VERY loud ... she is the one that will get me yell SHUT UP!!
Beautiful bird and worth the downsides to get that loving little purr in your ear!