I have the old style and step mine alone all the time. The easiest way I have found to step it is to turn the boat on it's side with it tied to something so it can't fall. Then attach the mast and right the boat. I takes alot of room and some soft ground but it works really well when solo.

Once you go cat you never go back! Nacra 5.2 (Elsies)#1499, running an inter17 spin!