Hand jobs?

Okay so I guess you could say that I don't have a lot of sexual experience. But I've been talking to this guy and we've been hooking up quite a bit. And every time that I've given him a hand job, he just doesn't seem to get anything from it. If I go down on him, then he loves it, but he just really doesn't seem that into hand jobs. I don't know if it's me or not!! Does anyone have any pointers to give a great hand job?