How do you learn to design tattoos? You should start with paper and pencil as early as you possibly can. When you are in school, take art classes and practice drawing as much as possible. If you have a love of art and a talent for creating beauty on paper, you may be just the person someone needs to design tattoos.
If you have already gone through school and have a flair for art, you too can learn to design tattoos. Contact a local community college for classes in art or even in tattoo art specifically. They are becoming increasingly more common. Check out some books and websites devoted to the art of tattoo design. Go to a local tattooist and ask about the possibility of submitting some of your work or learning under his tutelage. You never know, maybe you were meant to have your art walking around every day. Maybe you were meant to design tattoos.