You can learn to sail cats on an TheMightyHobie18 with a little help and good sense (feed him beer AFTER sailing). You can rig the boat solo no problem, with the possible exception of raising the mast by yourself. I'm, 6', 160 pounds, and I could just barely raise it by myself. I always recognized that doing so was always taking a risk, of losing control and dropping it (a gin pole and the trailer winch can be rigged to safely raise the mast solo). You can safely sail it solo in light winds (less than 12 kts maybe?) once you have enough skill to sail upwind and down, and control the boat enough to avoid hitting things you shouldn't. With skill, you can sail solo with the jib. Wear your PFD! Read books on sailing catamarans (which are different from monohulls).
You CANNOT right a TheMightyHobie18 by yourself. Seal the mast completely so it won't take on water, or the cat will turtle (mast straight down), which makes it much harder to right. Don't sail it overpowered solo without assistance available. And approach ocean sailing when you have more experience, the consequences of mistakes are much greater.
The 18 is less susceptible to pitchpoling than the 16, but it can(and will) be done. Learn to move crew weight aft, way aft, when the boat is being driven hard off the wind. The skipper keeps one eye on the lee bow the whole time he's powered up, being prepared to steer out of trouble or dump the main (and jib?).
Go for it! Be conscious of not sailing beyond you skill level. And feel free to ask this group questions, they're very generous with their time.

Dave Spokane, 509 276 6355