Form a U shape with your thumb on one side of the U and the rest of your middle finger being the other part. Now place your fingers on each side of your wind pipe under your chin. Basically around your voice box. Now apply pressure upwards and inwards. While doing this try to either hold your breath or breath very steady and shallow. Breathing can overide the effect and let the hiccups thru but sometimes you can get away with breathing while doing it. Normally takes about 30 seconds to cure hiccups but sometimes it can take a tad longer. Repeat as needed.