I don't know how anyone ccan possibly get those tiny covers on each claw, you gotta be kiddin! I can't even see how folks trim them.
We've got ours (6) about 99% trained to stay off the tables and counters.
They still go through spells of climbing the screens, but that's down as well.
They used to claw the corners of the furniture, but that's way down to about 95%.
The still want to claw/knead the tops of the furniture if they are up there and see us. Kind of like they're happy and greeting us. When that happens, we try to lift ther paws while trying not to scold them cause we still want them to be happy to see us.
For the other clawing and undesireable behavior issues, we did use a squirt gun, in conjunction with shouting "DON'T DO THAT"! We try to always say the same thing, but lately I've been adding some common specific terms.
They are smart enough to know which one is the offender, if more than one is in the general area, so i figure they can learn some simple phrases.
It did take a while (months), but beats cutting off their fingers.
We put clear packing tape on the corners of the couch, and that helped as well.
Sorry about the novel.