[quote=Dogboy]What type of boat?
If you're able to safely lift the mast solo, then you can usually use one of the halyards to tied to either the bow tang or the mast stand on your trailer to hold the mast up while you pin the forestay. I.e., tie the halyard to the bow tang loosely, raise the mast, tighten the halyard and cleat off securely, then jump down and pin the forestay to the bridle, finally release the halyard.
For tightening the shrouds, you can either put on your trap harness and sit in the trapeze while you adjust the pins, or you can again use the main halyard and mainsheet system to hold the rig up. Connect the main halyard to the end of the boom and hoist the boom up about 3 feet off the rear crossbar and tie off the halyard securely. Then push the boom over to one side of the boat, crank down on the mainsheet and cleat off securely. The shroud will be slack and you can adjust the pins. Once you have the shroud re-pinned, release the mainsheet and tension the other side.
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