If you prepare the documents yourself there are no legal fees. There is a government imposed fee of $526.00 for a Divorce application, payable on filing the application. This fee is $250.00 if the application is filed in the Federal Magistrates Court. Pensioners are exempt from such fees. The fee can be waived in the case of hardship.
The Exemption and Waiver forms and details can be obtained from the Family Court Site.
You may be able to negotiate reduced fees with your lawyer, on the basis that some of the work is undertaken by you. For example, you can usually safely attend court for the hearing without a lawyer.
For further information on costs and the method of charging, refer to the summary of the Family Court 's "Costs of Family Law Proceedings" Pamphlet.