I taught myself for the most part. After stumbling with the process for weeks, I talked another quilter (secretary of one of my husband's colleagues) into evaluating my work. At first, she was reluctant but finally relented. She gave me lots of help, loaned me books, let me watch her, etc. All this helped me tremendously.
The best way to learn is just do it! If it isn't correct, rip it out and do it over. Eventually, you will catch on.
This website is marvellous for beginning quilters. So many tips - even for us experienced quilters.