Declawing a cat is a really big decision, and one that can have permanent repercussions for you and your animal. I'll try to summarize some information for you.
Declawing a cat is no simple procedure. It's not simply like trimming their nails or even cutting them off entirely. A cats claw is actually infused with their finger, so declawing them is basically like chopping off part of their fingers. If you want to compare it with a human procedure, it would be likely chopping off your fingers where they bend. It is very painful for the cat and has been banned in many countries for being inhumane.
While declawing a cat obviously removes the risk that they will scratch you and damage your house, it poses other risks. Many cats are reported to have mood changes after the operation, and some tend to be more aggressive and bite more (and a cat's bite is MUCH more dangerous than getting scratched). Declawing also takes away their natural weapon- should your cat ever find himself against another animal, he will have not way to defend himself.
In summary, you CAN declaw your cat. It's not the end of the world for the cat, and many declawed cats live healthy, happy lives. But it's a BIG decision to consider, and it may have negative repercussions for you and your kitty.