After 5000 miles, you probably won't need that class. Instead, after 5000 miles, find a few people to ride with... not guys who have been riding for eons, but for just a few years. Just one or two at a time. That way you can watch and learn and get advice.
A guy I met at my first Death Valley rally took me under his wing and started teaching me dirt basics. He rides a DR200 and is tall like you. Whenever I'd get wigged by the terrain, he'd ride my bike for me until I was comfortable tackling it myself. Try to find somebody like that who will help rather than tease.