The Art of Jewelry Design from Idea to Reality by Elizabeth Oliver is an excellent book to add to your collection for your DIY design education. So many people come to jewelry making as a second career, or through beading, and lack the advantage of a formal design education.
Luckily, there are some terrific books out there to help you. (See previous post.)
This book can help you take your design skills to the next level, or at the very least, help you become aware of your own process.