Since you just got the boys, stay with them while they are getting their nails done, so they'll know you aren't deserting them. That should help keep them calm and less afraid. Though they will be afraid of strangers.
I only clipped the claws on the cat who was too old to manage the scratching posts or chewing her nails herself. when the others were clipped despite the affection showered on them, they made it their mission to sharpen the remaining half claws until they were points. that did the sofa no good at all.
Have you thought of getting a couple of styles of scratching posts? Mine always liked the ones that were flat on the floor, or flat enough for them to stand on to scratch. One was known as our banister. But if they like that, you can tie a small rug to the banister and it makes an excellent scratching post.
I only clipped the claws on the cat who was too old to manage the scratching posts or chewing her nails herself. when the others were clipped despite the affection showered on them, they made it their mission to sharpen the remaining half claws until they were points. that did the sofa no good at all.
Have you thought of getting a couple of styles of scratching posts? Mine always liked the ones that were flat on the floor, or flat enough for them to stand on to scratch. One was known as our banister. But if they like that, you can tie a small rug to the banister and it makes an excellent scratching post.