A - Have new crew get used to the trapeze on dry land. Let them practice getting in and out. Show them proper footing and bracing. Front leg stiffer / straight, aft leg bent and the "shock absorber". Get them out there and push them a little from behind to get them used to the boat in motion and how to brace for deceleration. Spend some time, it pays off on the water.

B - You can always use the traveler to prevent the hull from flying when sailing with less weight on the wire. Travel out and sheet normally.