Actually, this isn't about stopping your cat from scratching at all. It's about redirecting them from furniture and doorframes to appropriate cat furniture.
Managing Destructive Scratching Behavior, the videos cover why cats scratch, how to choose the right scratching post, and proper claw maintenance. Each video is only a couple of minutes long, and they offer some useful tips. Although, they did not explain how to get your cat to sit still for the clippers; the cat they used is definitely not normal. Or, maybe mine are the abnormal ones. Hmmm.