New kitten... So nervous :( Help.?

I just got a cute little blue siberian kitten two days ago. She's very sweet and we're keeping her in one room for now. This is my very first kitten. She was nervous in the beginning but now she's playful. Yet, I just keep feeling so worried and so stressed that I've even begun to cry. When she tries to get up on the leather couches that we have, she ends up scratching them by accident. And We put bed covers over the couches to protect them. And I put foil under the couches so that she doesn't do damage underneath. I also cut up some cardboard to serve as a barrier to prevent her from going behind the TV, since she liked playing with the wires. I did spray some vinegar and bitter apple spray on the couch, wires, and rug. Sometimes she likes to dig her claws into the corners of the couch, bite on pillows, and scratch/bite the rug. And I will firmly say "No" but that hasn't been working, so I pick her up by the scruff of her neck and say no again, and put her on the ground. I find myself doing the same thing when she starts scratching the bottom of the couch. I am trying to teach her to use a scratching post, and i did this by shaking a little toy over it, and she climbed on the post this morning. I gave her a treat and a nice pet when she did. But I keep thinking to myself, "How many times do I have to do this before she learns" I've been keeping watch on her for two days, and I can't even sleep. My mom is buying couch covers for her couches...but we decided that if the scratching becomes a real issue, then we just might have to get her declawed..which makes me even more nervous. I do know that it is a cruel procedure and I really don't want to harm my little kitten...but what else could we do.. I know about nail caps, but I also know that cats like to take them off and if I keep buying those every month, its 15 dollars or so every time, and the declawing might even save money. But i'm nervous about personality changes as well. She will always be an indoor cat, but I also worry about my bird. I'm worried about how to keep her away from it. When we decide to let her explore the house, I might keep my bird in a room that she can't go in. This bird doesn't go out of its cage, so i'm not worried about the cat chasing it around the house while it's flying or anything like that. My main concern is the scratching..I've been so restless and my anxiety has been crazy. :( Any suggestions?