Easy-peasy to trim a cats claws.
Take a regular nail clipper, I mean yours, not a pet one. If you gently squeeze a cat's toe, the nail will extend. The nail is clear, you can see the vein, but don't even cut that much. If you hold the clipper under the paw at a 90% angle, when you extend the claw, the "hook" will go right into the clipper.
Also, just like when you cut your own nails, a cat's claw has a long side and a skinny side. You wouldn't put the cutting edge of the blade against the skinny side of your nails, beccause it would twist and crush before cutting. Same with a cat's claw. Cutting edges agains the wide sides of the claw.
Don't try to do them all at once, one at a time with lots of petting and only when kitty is calm. I am at a decade low with only 5 cats and trimming nails saves lots and lots of wear and tear on my furniture!
This is easy. I used to do rescue and had cats in and out all the time, taming down ferals and the like. Cat's don't object to this unless you crush the nail or try to do them all at once the first time. Just one or 2 here and there. You can also get one or 2 done while they're sleeping