Im assuming he has a nose ring in already since he's been shown before? When we are refreshing an older bull for show, we start by working them in a corral. Use a good halter, I like Sullivan's rope halters with the slider ring, and a separate heavy rope clipped on his nose ring. Use the halter to do the leading and cues, only use the nose as a reprimand and e-brake. Work in small circles and get him to break at the poll and engage his rear third. Lots of small figure 8s do the trick. If he starts thinking too much or acting squirrelly, spin him around in tight circles and get him back in the game. Most of the tricks that work on horses work on cattle too! Dont get in a power struggle, you won't win. Just out-think him and keep his nose where it belongs. And of course, lots of time tied standing helps also. Good luck!