agree - all hobies should have a righting line (whatever style you like best) If you sail solo you might need some extra "help" - this might be a water bucket or a soloright pole.
My experience differs from Daves in so far that on days with 15 mph and more I (160lb) can actually righten the boat solo with just the righting line. Here it is more technique - turning the boat to a point where righting is assisted by the wind blowing into / under the sails. On days with less than 10 mph I need to use some help (soloright pole). On days with 10 mph and less I should not capsize - theoretically speaking
Patrick