without a picture i cant say for sure its a wart, but the best way to do it is to put him in a chute or between a couple gates so he cant jump around and hurt you or himslef, hes gonna get pissed more than likely but you definatley want to take care of it before it gets worse, tie his head where you can work and grab it with the pliers and squeeze as hard as you can, basically make the two sides touch eachother then twist and pull of. it will bleed a little but nothing major. a little blue coat sprayed on it would help if it started bleeding too bad.