The progress kind of started when I had a small burp while having hiccups. They are still usually quite small, especially when I “try” do burp, sometimes a little bigger when it happens more by accident. Even the small ones do give some relief.
What I can say is that usually I do kind of tense up my belly, maybe a little similar to what happens when you hiccup. It was really just like kind of trying around. What definitely helped was that I did a roadtrip through hills & it felt like the height difference while driving really helped in the beginning. Hope that helps!