I can definitely relate to this concern. I get really worked up in high-stress situations that hinders my ability to perform well. As others have mentioned, experience is a good way to work towards better problem solving. You'll be able to find out what works, and what doesn't work. Closing night of the only show I have ASMed we had a wardrobe malfunction right as I called places. One of the lead actresses' dress tore right on the zipper in the center of her back and we had to hold the show for 10 minutes in order to sew her into her costume. It being my first time ASMing I really didn't know exactly what to do. I knew I had to be the liaison between my SM and head wardrober, but I had no idea what to do as far as what to specifically say or ask. In the end, it all worked out fine and wasn't the end of the world, but the situation could definitely have gone better. I'm looking back on it as a great learning experience, and now I know how to better handle those types of situations for the future! Don't beat yourself up for making mistakes, they're gonna happen ~ after all, nobody's perfect!