You open the drawer. Before the clippers are in your hand, your dog is gone. Trying to finish all four paws while someone holds them still might get the job done once, but it makes the next attempt harder.
First, ask your veterinarian whether your dog's nails need trimming and how soon. Clicking on the floor alone doesn't prove it. A nail growing into a pad, a torn nail, bleeding, or pain needs prompt veterinary care, do not turn it into a home training session. A vet or skilled groomer can also handle urgent trimming while you work on future comfort.
Start with an empty hand
When your dog is relaxed, briefly touch a shoulder, reward, and stop. Over sessions, move gradually toward a paw. Let them pull away, that tells you the last step was too much. If a paw seems unusually sensitive, have a veterinarian check it.
Separately, put the clippers on the floor at a comfortable distance and scatter treats nearby. Later, lift the clippers, set them down, and reward. Your dog does not have to have a paw held at the same time. Once both the handling and the sight of the tool are easy, bring them together for a moment and finish. You can introduce the sound by clipping something harmless away from the dog before the tool ever touches a nail.
When your dog is genuinely comfortable, trim only the very tip of one nail and reward. Don't try to cut a long nail down in a single go: the living quick can extend farther than expected, and dark nails make it harder to see. If you are unsure where to clip, ask your vet to show you. One easy nail is better than four paws of struggle.
A dog who can leave and still chooses to return is showing you the pace works. That matters more than finishing the whole job today.
Sources: Dogs Trust: How to clip your dog's nails. Dogs Trust: How to handle your dog.