Each Guild elects its own President, Secretary, and Treasurer. Plans their own program, decides on meeting times and places, and how best it can further their aims.
An annual fee is payable which covers membership to Girl Guides Western Australia (this includes insurances); administration of the State and Australian Trefoil Guild; and membership of the International Fellowship of Former Scouts and Guides (IFSG). There may also be a fee payable to their Trefoil Guild.
Trefoil Members may wear 'Trefoil Guild Dress' which consists of a white blouse with a navy skirt or pants or informal dress. A Trefoil Guild scarf is generally worn as part of the 'Trefoil Guild Dress'.