Insane

As my calf is still rather tight and sore and I still want one more multi sport race this year I'm going to do a Try a Try this weekend.
I have never taken swimming lessons, I get nervous at Sauble beach in the waves, and quite frankly have never swam 400metres before. I got a couple of tri members and lifeguards to take a look at my swim and they both assured me it is not dangerous for me to be out there.

My goal is not to be rescued by a lifeguard and finish the swim. Prayer is needed, and maybe a wet suit- anybody got one?