For this you will need to make a full room out of netherrack including the floor. then, you need flint and steel to light the inside of the room. Just for looks, you can add fire at the top. After that, you can put a window on it to watch him die, if you want. Then you just wait, or you can dance around and wait for it to come. (this might not work, cuz he could teleport out. Most of the time, he won't) hope this helps!