I didn't cut Ebonie's claws regularly when I first got her, and her claws grew into her pads, so I had to take her to the vet to have it done. 

 After that, I made sure that I did it regularly.  Neve hasn't let me clip 
all her claws at once.  I've been able to do a couple, then do a few more a little later, then finish them the next day.