I posted in your other thread, so refer there for addressing of other issues.
I've got soft claws on all three of my cats. They are easy to put on, but I have to wrap Miggy up in a towel burrito style because of his hissing and growling and constant fleeing. If yours is a big cat, I suggest a big towel.
My most recent cats were 2.5 yrs old and had never had their claws clipped. Hence the towel. But they've gotten used to it very quickly. In 4 months its gone from a few growls from Petal to none and many growls and hisses from Miggy to a couple. Also, I'm more used to it as well and can do it faster. They lose about 4 claws a week, so it's something you have to keep on top of. Also, I do not put them on their back claws.
As far as the scratching goes, Petal likes to scratch on the side of the sofa ( tweedy material) and the soft claws can still "grip" a little bit on this fabric. But when she scratches on the box spring the soft claws just roll right off without any damage. I think on screening material, the soft claws may still grip a little bit, but he'd be unable to actually climb the screening. If his claws are larger than a medium, though they may not grip at all, as the larger soft claws have more of a blunt tip. Miggy wears a medium and some of his claws really deserve a large, but I just prefer the smaller size for appearance and retraction purposes.
Cheapest price is atcat and kitten store