Oh yes Rebecca, twisting wire. It really is as easy as it looks, but due to the "nature of the beast"; my wire does not always twist consistently either! If you can, twist some wire veerry slooowly and watch it. You will see that the wire twists at both ends, each toward the center, meeting in the middle. This means that the middle does not twist as tightly as each end.
The only way to twist consistently is to plan for about 1/4-inch on each end to twist more tightly and then cut the ends off. For example, with the Orbit Earrings, cut your wire 15-1/4 inches long, and then cut in half. This will give you two 7-5/8 inch pieces. Your pliers and drill will each hold 1/8-inch, leaving the additional 1/4-inch on each end that can be cut off.
For lots more information about twisting wire, please see my article: Getting Twisted
, and congratulations on your success, Rebecca!