You do realize a little girl named Ellen MacArthur single handed a 75' triamaran around the world.

http://www.amazon.co.uk/Race-Against-Time-Ellen-MacArthur/dp/0141026480/ref=pd_sim_b_1

Sailing a beach cat solo is not hard, but like everything else, you have to pick your days, prepare, and practice. Start out in light wind and work your way up once you get your coryography figured out.