Use your hands to pull one wire to the left about a quarter way around. The wires will start to form an s-shape to make the interior of the spiral. Repeat with the second tail. Switch between each tail of wire, forming the spiral and keeping it flat. Stop when you have about 1/2" tails remaining on both wires. Be as free-form as you like and don't worry about getting a perfect spiral. A free-form spiral looks great with this design.