The beauty of this method is that it requires no gadgets, cups of water, or anything other than breathing correctly. Nor does it require heavy breathing. On the contrary. It works by removing the irritating gap between the inspiration and the expiration, thus creating a continuous flow of slow-moving breath.
Imagine breathing in a figure-8. As the outbreath reaches the end, slow the breath and twist it around so that it becomes the inbreath. Then simply create a figure-8 of continuous breath. The hiccups will subside almost immediately. It usually works within 10 cycles. Most of the time less.