I don't believe in declawing - because if they get out (we live in the country) that is their super-best and utmost defense! Without claws they are vulnerable to anything. I would suggest a scratching post for indoors - there are such cute ones out with little cubicles to excite their imagination and look nice in your home too - and spray it with a "catnip" spray (you can find at Wal-Mart or pet shops, and as long as you are stern (No!) with them over the furniture, shouldn't be a problem. Sometimes our cat will "tear hell" out of that scratching post and then walk away quite satisfied. :-) Of course she also has lots of logs outside.
Marysewfun