Agree with this, you don't want to kill any of them unless its a male and you don't want your girls to be seedy. Also, if you really, really want them to be separate plants then you can clone each of them and give them each a potI would say do not try to seperate them. It's too late, the root ball is going to be a mess. Transplant into a huge contanier so they all have new root room to grow or in a big hole outside. They shold prosper more this way then yanking them all out and ripping the roots...
My opinion is to not seperate at all but just givet hem a ton of more root space.