Once you get them to eat on their own, you are pretty much home free. Hatchlings are easily stressed out, so for the first month of its life, don't handle them. First, lets talk about your setup. Each hatchling needs to have it's own enclosure. Putting them together might cause them to be stressed and hurt their chances of survival.
Some people have plastic shoeboxes set up for their hatchlings.
This is the best setup to minimize stressing out the gecko because they can't see anything but the walls around them. A healthy hatchling feels safe in its surroundings. If they can see you walking around the room, it could freak them out. I place a lizard mat down on the floor and cover it with a paper towel. This is to make sure that the young gecko's digestive system doesn't get blocked with substrate and possibly killing the hatchling.