How to Properly trim a Chickens beak.
Also wanted to add that if you accidently see any blood. You can put something like quick stop (for dog nails) or even basic things you have at home like flour, or even baking soda. and pack on to help stop bleeding let it clog for a few minutes. You can also do this with combs if you can keep others from pecking the flour. You definitely may want to separate if you needed to do a comb.