DIY

You can try and reach an agreement without outside assistance or intervention. This is obviously the most cost-effective way of proceeding but success will depend on you both being able to come to an agreement which sometimes can be very difficult to do. 

Perhaps you feel the time has past for reaching agreement yourselves. Often parties are simply unable to speak to each other because a break down in a relationship usually involves a break down of communication between you so although a DIY route might be possible, in most cases it is not.