I taught myself hand applique. It was really easy. I think it's totally doable to teach yourself. There are many methods, so I'd start reading blogs and here on the board, to learn about the various methods.
There is a 'virtual' applique area that's been started here on the board for folks wanting to learn. (Click on Virtual at the bottom of this page, and look for the Applique one.) It has many links to blogs that explain and demo the applique processes.
Have a wonderful time!