By skyforbes 
Hold the trimmers in one hand and the cat’s paw in the other. Use your thumb and forefinger to gently press on the cats toes so that the claws extend one at a time.
Once the claw is out, have a look at it. It will mostly be clear, but a few millimeters into the claw (right after the curve), you will see it begin to get cloudly on the bottom side. That cloudy area is the quick. The quick is living tissue and you should avoid it at all costs. Cutting down to the quick will cause pain to the cat, as well as bleeding.
I tend to only trim 1-2 millimeters off the claws at a time. It is better to trim small increments often than take off too much and cause injury.
You’ll trim the back feet in the same way as the front. The only tricky claws to trim are the “thumb” claws on the front paws. Too get them out where you can cut them you’ll need to use your whole hand and be a little ambidextrous. 😀