I have a nacra 6.0. The mast is a beast, and lifting it alone is nearly impossible.
I setup an electric winch and clip the cable to the end the forestay to pull the mast up. With a remote in hand, I lift the mast up from the ground and walk to the tramp. I climb on the tramp and let the winch do all the work while I keep the mast from swaying. Here's a rough drawing of it.
I've been doing this for 3 years and it works like a charm!
