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This is how I incubated Corn Snake eggs. The process can be modified depending on the species.

Obtain a 2kg plastic margarine container and fill it with coarse vermiculite. Empty the vermiculite into a large saucepan and fill it with cold water. Stir the mixture every 30 mins for about 3 mins for about two and a half hours. The reason for stirring is to release all the trapped air.
Drill 2 holes of about 3/16" diameter about a third of the way up in the four sides of the container each hole about 2" in from the corner. Drill approx. 10 holes of 1/16" in the plastic lid.
If the thermostat you are using has a water proof probe drill one hole in the side the same diameter as the lead, then make a cut from the top to the hole so that you can bury the probe with the eggs. If not place the probe inside the incubator
When the vermiculite has been soaked for the above time gently warm the mixture to approx. 85of - 90of. Drain off all the surplus water and then half fill the container with the vermiculite. Place the eggs on the vermiculite (try and maintain the position of the eggs i.e. do not turn them to much) if the eggs are stuck together this will not matter to much providing they can be covered with more than 1" of vermiculite. After 'planting' the eggs fill the container with some of the remaining vermiculite. Carry the container to the incubator and if the stat probe is to be buried with the eggs if possible. Fit the lid to the container and place in the incubator.
Incubator temperature for corn snakes should be about 82 - 84of.
After about 57 days look inside the container and remove any babies that has hatched. There is no need to dig up the eggs before they hatch. From the first baby to the last one may be as long as 10 days.
If you would like any more info please contact me.