Wow I have yet to ride a flying change but then again my horse isn’t trained in dressage but I’m training him. Like in leg yields, shoulder ins, just rounded on the bit ect. It took me around 6 months to teach him to drop his neck on the bit, I have ridden one flying change by accident lol but that was when he was freaking about something and was playing up so he changed legs on meI'm pretty much doing whatever my trainer wants me to work on. I've gotten really good at flying changes with the gelding I ride, as well as working on lateral work. I havent riden in a couple weeks though