You only need an incubator if there is no place in your house that can maintain the temperatures needed to allow the eggs to hatch. The temperature can fluctuate a couple of degrees during the day/night...but need to be in the right range to allow them to incubate/hatch. (IMHO, it needs to be a dark spot.)
For over 15 years, I have used a people's heating pad that will cycle on and off but maintain the temperature. Over it I place a wood and screen frame that the containers of eggs can be set on. (I have hatched a variety of chameleon, gecko, conehead, waterdragon, turtle, etc. eggs using this method.)
I use shoebox sized plastic containers with lids to incubate the eggs in. I punch two very tiny holes in the lids. I fill the containers about half full of slightly moist coarse vermiculite and lay the eggs in rows about 1" apart in all directions in dents that I make with my thumb. To test the vermiculite for appropriate moisture level....take a fist full of it and if you can only squeeze a drop or two of water out, then it should be right. I only fill the container half full so that there is "head room" for the hatchlings when they come out of the eggs. I separate the eggs by 1" because it makes them hatch more individually instead of all at once.
Hope this helps!
