As one who sailed monohulls for many years and then purchased a cruising cat and single
handed her for thousands of miles I have to ask- what is the difference between sailing a monohull
and sailing a cat? And what do you expect to learn by crewing
on another persons boat if you are already competent on a monohull
The only real difference I could find was in the absolute joy of docking
with twin engines. Other than that (and it took me two minutes to master it- stop using the rudder
under 3 kts and concentrate on the engines) there really isn't any difference. Sure the cat is faster off of the wind
and sometimes it doesn't like to come about. But these differences can be experienced on a beach cat or figured out in an afternoon sail with a cruising cat and in any case aren't life threatening.
I guess the only possible life threatening issue is when to reduce sail or change course to avoid the rare possibility of turning turtle. I never came close with my cat. That knowledge comes from sailing many miles with your specific cat.