hey james,

I sometimes sail alone in light wind 5-10 mph, maybe 15 mph if some motor boats are present on the local lake(for rescue purposes if I flip). The 16 is easy to set up single handed in about 15 or 20 minutes.
The secret is to not flip. At a 150 lbs there's no way I can right the boat with my righting line and chances are the boat will turtle. Just play it safe when you're by yourself , watch the wind, and be ready to let that sail out when necessary to avoid that worst case senario.
I wouldn't sail alone in the ocean, it's just not worth the risk. You could also look into a righting pole, I've heard they work well.
All that being said, I've had a blast by my self while out on the trapeze and on one hull. I haven't flipped in four years and with the new shorter shrouds lines the boat doesn't want to pitchpole as much so it's a lot safer.