I decided I was tired of paying for pack jobs and wanted to re-learn how to pack. I watched a bunch of videos on youtube, and then went and asked a packer who is close to the same build as me if he'd take some time and assist me if I get stuck during any part of the pack job. He was really cool about it, and while it wasn't a true "packing class," I learned everything I needed to know just asking him to help me through the parts that were the most vexsome for me.
I skipped the important bit: I asked him beforehand how much he charged for a packing class. He told me $35. I gave him $50 up front that morning, and asked much less of him than a dedicated packing course. I got what I needed, he got way more than he expected, and everybody's happy.
Take care of your riggers, and they'll take care of you!