well with experiance, you will know what to do in a slpit second, I do agree that learning how to trim should be taught when teching a new flyer. What I have found out is that new pilots, even after they have soloed are way to scared to take there hands of the stick to hit the trim levers, they have to look down to find them. so thats why I feel a new pilot shouldnt be trimming a plane that has never flown before. they would really need to get comfortable on an already trimmd plane and make minor adjustments to it