You don't mention how old the kits are.  Most kits do nip or bite.  You can
put Bitter Apple on your hands and feet.  This is sold in a Pet Store where
the dog stuff is.  You can put the ferrets in their cage for a time out.
You can also put Ferretvite or Nutri Cal on your hands/fingers.  This is a
vitamin suppement we give everyday.  When they nip/bite you can scruff
them, put them to your face and hiss and say No Bite.  You can also scruff
and hiss and drag them for a few seconds on the floor.
 
Good luck and it does get better.
 
Debbie
[Posted in FML issue 2591]