If you have an Isomat boom... here is a scheme for it. Otherwise it's pretty standard from boat to boat. The Isomat boom has extra sheaves in the end....
This is simple set up for my boat.
"Jiffy" also means "slab" reefing.... it differs from older method of tying in nettles or gaskets along the length of the sail by simply tying down the new luff and clew points with one or two centrally cleated lines.