I was out on a trapeze last weekend for the very first time. It was on a brand-new C2...and it was windy. Pepin's description is exactly what worked for me. I had some harness adjustments to make, but once I got my shoulder straps supporting me it was just like laying in a hammock, very relaxing (Ronstan CL11 harness). Things I took away from this ride (other than it was terrific fun!) :

1) A new cat right out of the box is extremely slippery!
2) C2's are very fast!
3) If you put most of your weight on your rearmost leg, any small amount of water hitting your forward leg will sweep it off the boat, taking your other leg with it. At this point you are now being dragged like a hooked fish at 15 knots. I found grabbing the handle was necessary to be able to get back on the boat!

I'm not sure whether leaning towards the bow or keeping your weight equalized is better, or whether it's necessary to keep your knees a little bent so that minor hits don't destabilize you. Bottom line - if I can do it, you can do it!