Okay, I saw you've wanted to hatch out apple snails and haven't been able to do so successfully yet. So, I'll tell ya what I did to get little baby snails (you can skip ahead if you already know what I am about to detail in the next couple of paragraphs).
Well, first, you need a male and a female apple/mystery snail to start off with. Yes, in the apple/mystery snail world, there are two separate genders. The male will climb aboard a receptive female, mate and leave to find other females to mate with. That's his job. He's done with the reproduction process and plays no further part.
The female then climbs to a suitable surface above the water and lays her clutch. If there are no males around and she is full of eggs, she'll still lay them, even though they are not viable. When I first had gold mystery snails, I would just leave the egg clutches where they were and let nature do its thing. Some people remove them with a razor blade (yes, some eggs will break when removing them but you've got 100-200 potential babies in a clutch so its really not a loss), wrap them up in a moist paper towel, and place that wrapped bundle in a plastic baggy. They then place the baggy, with a few holes in it for curculation, in a warm spot (like on top of a desktop computer's tower or something). Some just place the egg clutch in the paper towel and in a small plastic Ziploc container and let that float on the surface of the tank water. Meh, to each his own I guess.
It takes about 1-3 weeks of incubation (depending on your air temp/humidity) and then the babies will begin to eat their way out of their individual eggs, and drop themselves down to the water below. If you've removed the egg clutch, then you'll have to manually dump the babies in the water. Its imperative that the clutch not get too dry, to warm, or too wet during incubation.
Its really not that hard, though it seems like it, and once you've got the hang of it, you'll be up to your eyeballs in snail babies in no time.
“The day the power of love overrules the love of power, the world will know peace.”
― Mahatma Gandhi