Learn to trim claws - Felix is young enough to get used to it. Also, when he starts attacking with claws, make a hissing sound. That will stop it.

I know a few posts here sound strict on declawing. In England and other European countries, it is against the law. And there is a reason.

Just do a little Googling on it and research it for yourself.

Also - Google Soft Paws. They are a good fix - and many cool colors!