1)Make them hold up the mast.
2)Use a shroud adjuster and split-ring pin (they can just slide the pin in and you can put the ring in)
3)Step the mast going downhill, so gravity and side-stays will hold it up while you walk to the bow and hook up the fore-stay
4)Run the jib halyard to the bridle and back to the base of the mast (might need to tie on an extension). Hoist the mast up, then pull the halyard tight and cleat it off. Walk to the bridle and hook up the forestay. (No need for crew's help)
5)Find smarter, or at least more dexterious, people to crew for you (I'm making a joke, not being an butt)