From the picture of your boat. Three bodies in/near cockpit.
Main, Helmsman (you),
Jib Trim. Jobs:
You - Steer on and take mainsheet if main guy needs to help do something else. But, this should not happen if every does there job well. Sit with one leg so that the handle end of the tiller is in between your knes with you back parallel to the tiller handle.
Main - Sheet and Traveler. Sits with legs between stranding traveler track on brdige deck or slightly behind, but in front of you. His job is to trim main, work traveler, and release
jib during tacks. Sequence: Helm says ready to tack, Main trimmer moves traveler to middle. Helm says tacking and Main releases active jib sheet. As soon as released, jib trimmer pulls in new active jib and trims it while main moves to windward side, moves traveler up to new side and and touch trims the main if necessary.
Jib Trimmer - Sits to windward just in front of main trimmer. When command for ready to tack is given, wraps lazy sheet on
winch, but not in self-tailer. During tack, main trimmer moves to windward side, jib trimmer stays low and hauls in now active sheet on jib and trim until sails trimmed. Once the sail is trimmed, moves back to windward side. Drops back down if sail adjust is needed.
DrB