Don't think of "mistakes" as mistakes. Think of them as learning opportunies and as a reason to be creative. You don't have to be perfect either. If you look at quilts by very talented quilters, it is easy to think that you should be able to do that too. Not so. Accept the fact that your beginning quilts are beautiful, even if they aren't perfect. None of my quilts are precison made, but they are beautiful to me and made with love for whoever I give them to. "Good enough" is good enough and you don't have to spend time "fixing" every little detail. I agree that you should take a quilting class as it is easier to learn good habits from the start. Pick an easy fast quilt pattern to start with. For people who have never sewn or quilted before, I always start them with the Quilt In A Day Log Cabin pattern as it always looks fantastic when done, it's easy, and it's quick. There is a book with explicit directions available for it too. Read through some of the prior posts when you have time. You'll get a sense of what others are doing and learn from them. Remember that no question you have is "stupid" as everyone is friendly and willing to help you along. I have often learned things I did not know from a question someone thought was dumb. Remember to breathe!