Boy I'd hate to live where you do... Seems like no man's land. Haha
Can you ask around locally? Is there a dressage club? Or you can outreach to other english organizations and they could direct you. The way I found my trainer was through the local tack store. She doesn't really do anything "commercially", but her entire family are excellent at what they do. I'm honored to be taught by her and I would have never found her if I didn't ask around.
When you find one ask for homework, homework, homework. Then you can push lessons off to every other week. It probably also wouldn't hurt for your new trainer to be technologically savvy! This way, should something go wrong, you can send a quick video and she could offer advice.
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