SOFT PAWS, SOFT PAWS, SOFT PAWS!
Oliver did the SAME thing while he was living with my parents for awhile (he's confined to my bedroom there because he doesnt get along with the dog - although we're working on that - and my mom is somewhat allergic)... he nearly destroyed my bedroom and closet doors and one of my dressers as well as got a few slices in the wallpaper... we tried "no scratch" spray and that did NOTHING to deter him, so I went to petsmart and picked up some soft paws and they've saved our relationship (his and mine and his and my parents'), my furniture and my skin!! They are the best thing ever (as I'll NEVER EVER EVER
declaw a cat)!! Oliver doesnt mind having his paws touched and they're quite easy to apply... you can have a groomer or vet tech show you/do it as well if you're not comfortable... Oliver still scratches at his post and occasionally other things, but does NO damage!
The caps fall off one by one as the nails shed and you just replace them as needed! (wow, I should be a soft paws dealer, hahahaha)