I found an easy way too, I'll just slide the mainsheet traveller out, fix it there somehow (tie it somewhere, easy to figure out) and use it to tighten a trap wire.
Cheers!
On my TheMightyHobie18, i would turn the boat slightly off the wind (while on beach wheels or on the shore line), travel all the way out to one side... then crank on the main.. this would lock the boom/mast over and i could then get in my trap harness... slack the side stay and lower the pin.
