I understand that you're not declawing the cat but whilst claws and fingernails are similar, unless for medical reasons, i don't think any animals claws should be clipped and if it is for medical reasons then it should be done by someone who is trained. If you make a mistake it can be incredibly painfull to your kitten and also cause the claws to regrow deformed. Getting scratched is part of owning a kitten. It'll grow out of it. It's just playing and learning it's position within the houshold.