So here is a more detailed way on how I candle, just my preference.
1.) Tools: flashlight and hand.
2.) Process: Candle in PURE darkness, surround the egg with your index and thumb.
3.) Below are photos of my candling and how to hold the egg. Candle/flashlight goes on the bottom. I always...
I know you are not asking me, but I use a flashlight. Candle in pure darkness for best results. Even a small light lamp will cause issues when candling.