I also trim my cats nails once a week. I've used "Soft Paws" in the past and they are very easy to apply, providing you have another pair of hands to help you.

You need to trim the nails as short as you can before applying them. This will help them to stay on longer. They fall off once the nails have grown. Just re-apply them. They give you extras as well.

Sure beats declawing, which in my opinion, should be banned.