Jibing a yawl:
Haul your mizzen if set fairly flat; slack the lee jib sheet and haul in the weather at the same time, until this sail is properly trimmed. Get your mainsheet aft gradually. Put the helm up slowly, and if the mizzen is set jibe that first, then the mainsail. The reason for trimming the jib and mizzen is this: If when the mainsail comes over she knocks down the other two sails will shoot her up in the wind, and give you a chance to shoot her out. If the mizzen it not set, light your jib sheets sufficiently to allow her to come up.