Haha, if you want to do it that way, instead of crossing the reins over his neck, cross them under his neck. I've done that a few times as a quick fix, but its not the "correct way" and it doesn't really work well. What I did for my personal horse was first teach him to direct rein, which of course is the easiest. Then I got him moving off my leg. After you have those 2 things, teaching them to neck rein is easy just like everyone else said. But seriously, try crossing the reins under his neck, not over.