How do you cut a bearded dragons nails?

i have a bearded dragon who is 6 and i occasionaly file his nails with a nail file so he doesnt scratch people when we hold him it is not required as long as you keep rough items in their tanks for them to wear their claws down on. I would not clip or cut their nails just file i tried to cut his nails once and stopped after one nail because it shatterd. my beardie just sat their when if filed his nails like he was in a pedicure. good luck hope thaat helps.