i got 5 jills in a double hutch and a large run, trying to get them out 1 at a time is hell but you will get use to it. as for the nipping they will soon stop nipping hard and it will turn to a more playful nip that does not hurt at all, just stick with it and it will come to you, it just takes time. by the way dont seperate them, you would not like to be kept on your own and the ferrets dont either. good luck mate