I know that you should be pulling the mast up from the forestay and not the shrowds or trapeze wires. Hooking to one of these would make your mast swing to one side as you are pulling up. You then attach the trapeze wires to the crossbar to keep the mast from moving side to side. So to sumarize: the forestay for the up and down motion and the trapeze wires to prevent the side to side motion as the mast goes up (and down). Also, make sure there is a pin locking the mast in place at the base during this process otherwise the mast will pop right off as you start to raise it.
There are mast stepping devices that are available. Do a search on this website. I'm pretty sure they sell them here.

good luck