Cut one at a time
When I'm cutting my cats nails I focus on a fast and painless job to cut down on the stress for both of us. Developing trust is important. If you clip too much, even once, your cat will be even more difficult to get along with the next time around. So less is more. I think soothing your cat first is good; giving treats or a pill, if you've found an effect and safe one, is helpful. Get a good grip on your cat and clip as many as she/he will tolerate. With my cat, I can usually get through one paw before he gets worked up, sometimes more, sometimes less. If he/she struggles a lot, let um go, give um a treat and praise um. Take a break then move on to the next set of claws. It usually doesn't take me long, but if my cats particularly agitated that day, I might come back periodically throughout the day to get the task done. Anxiety builds, so once your cat is already worked up, it's best to leave um alone for a while to calm down. Most cats though, will not be overly worked up from the start. I cut my aunts cats nails as well (she has three) and I can usually get them all done within a half hour. Remember to get a good comfortable grip on your cat before you start. Also remember cats pick up on your mood. If you are nervous they will be too.