Decide what size the Libra tattoo will be and the placement on your body. Determine if you would like full color or black gray. Keep in mind that the more detail the design has, the larger the tattoo needs to be to prevent lines from blurring over time.
Determine if the tattoo is just going to be a Libra symbol or have added details. For example, a Libra that is a mother may want the traditional scales but will add her two children's signs inside the scale cups.
Print out or draw Libra symbols or the word Libra in different fonts or languages. Combine details of artwork if you like the scales on one drawing and the base of the scales on the other. Print the designs out at the size you are envisioning for the tattoo. Hold the printed design up to your body to see if the size is correct.
Take the design to a professional tattoo studio, and clearly explain any changes you would like to make to the design before the tattoo artist draws it up.