I am the owner of a small quilt shop, so I would like to respond to your question.
If you wanted to learn how to prepare a speciality dish from your kitchen, you would not go to WalMart for lessons.
The same is true for Joann's and Hancocks. Don't get me wrong, I have and probably will again, shop at those two stores. If you want quality quilting classes go to your LQS. Some even offer free classes if you buy their kit....I have done that in my shop.
Checkut your LQS and see what classes they have coming up. Pick one that suits your needs and sign up for it.
I also have lived in towns where the quilt clubs offer lessons sometime. In our little town, we have a community college and they offer quilting classes.
Hope one of thes suggestions help.
Virginia