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the way to backwind the jib is to crack the sheet as the tack begins, but hold it for a sec. on the upwind side of the mast until you are sure the bows are around. there is no reason to think that you will need to back up. the crew can totally get the bows around by babysitting the jib backwind process. as mentioned by others the jib needs to be sheeted to the new side very quickly once the bows are around. not torqued though. save that for once you are fully underway on the new tack.