One thing I like to do with any horse, but especially horses who are hyper-sensitive, is to sit on them (bareback is best) and just rub them with my legs. Rub them on the sides, by the flank, etc. and do that until the horse is completely relaxed. This will help build confidence. And when I do start asking the horse to do things with my legs I take things VERY slowly and see how little it takes. I go through my "phases" of asking them to go very slowly and I reward the slightest try. This is not tip-toeing around the horse, this is just making sure I'm taking care of his emotional needs, and he needs me to go slow, be very clear and have unlimited patience.