Create the Subversion repository
svnadmin projectname
Create the Trac Instance, add the admin user, remove all privileges from users who have not authenticated.
trac-admin projectname initenv
trac-admin projectname permission add adminuser TRAC_ADMIN
trac-admin projectname permission remove anonymous BROWSER_VIEW CHANGE SET_VIEW FILE_VIEW LOG_VIEW REPORT_CREATE REPORT_MODIFY REPORT_VIEW MILESTONE_VIEW REPORT_SQL_VIEW ROADMAP_VIEW SEARCH_VIEW TICKET_CREATE TICKET_MODIFY TICKET_VIEW TIMELINE_VIEW WIKI_CREATE WIKI_MODIFY WIKI_VIEW
trac-admin projectname permission add usergroup BROWSER_VIEW CHANGESET_VIEW FILE_VIEW LOG_VIEW REPORT_CREATE REPORT_MODIFY REPORT_VIEW REPORT_SQL_VIEW ROADMAP_VIEW SEARCH_VIEW TICKET_CREATE TICKET_MODIFY TICKET_VIEW TIMELINE_VIEW WIKI_CREATE WIKI_MODIFY WIKI_VIEW