All you need, really, are patience and a steady hand.
And, of course, the materials. In addition to eggs and dye, you’ll need some beeswax, a candle and a kistka, a wooden dowel with a small brass funnel attached to one end.
Start with a clean, white, raw egg. Place a small piece of wax into the larger end of the kistka funnel, and hold it in the candle flame. As the wax starts to melt and move toward the smaller end, draw wax lines on your egg.
You’ll be constantly moving back and forth between the candle and the egg, as the wax tends to harden quickly, and you’ll need to keep feeding wax into the kistka, as the funnel is small.
Any area covered with wax at this point will remain white on the finished egg.
Symmetry is key.