first and foremost, don't worry.. horses all get scared. What breed is he?
NEXT - don't let him take advantage. if he's scared, let him see what he's scared of, but he needs to get over it. Horses need to be used to a lot more then a field of grass. I've brought my guys and girl, through alot of things just for experience. When they were scared of tarps or bikes or goats, we'd make sure to keep riding past them til they got over it. If he can sense your nervous, he'll stay nervous. If he's scared of something, adjust him slowly to it. Assuming he's taken care of properly, he has no reason to fear such little things. Help him experience more and fear less. Now that he's shying at a leadrope, you know he's taking advantage. Just let him smell the leadrope, or plate, or whatever he's fearing. IF he freaks out and backs up, then take it away til he calms down, and then show him again. He'll realize it's nothing.
Count My Strides - Shane, Bought 2-18-06, Mustang.
"I whispered to my horse, "i'm afraid of falling" and he whispered back, "i have wings".