Before pulling them out (if you plan to do it on your own), cut off the ends of each quill. It relieves pressure and makes it easier to get out with less damage
You'd think they would learn not to mess with a porcupine after this, but no. I can't tell you how many times I've pulled quills out of my dog's muzzle.
"I regret nothing!"
Why did I do that
And the dog in the back is like
That was awesome dude!!! Let's do that again!!!!!