You can draft your separation agreement yourself however the best option would be to instruct a Solicitor to do so. A Solicitor would be able to advise you whether your interests are fully protected and whether any further clauses should be included within the agreement to protect your interests in future. The separation agreement needs to be drafted in a particular way in order to hold some weight in court. There are many aspects which would need to be considered when drafting a separation agreement and therefore having an experienced Solicitor to deal with this for you would be in your best interests.