Thanks, we spent a week in Tuscany in the beginning of June.
Sounds like you're about to be introduced to the wonder that is a chick hatching. Hopefully you have your brooder all set up. Remember, the chicks need to be left in the incubator until they're dry, and you can leave them there longer too. Better to not let out moisture after the shells have been punctured by opening the lid all the time. The chicks will survive three days with what they've absorbed from the yolk, although once you get them in the brooder, you should offer them water immediately. Some bird vitamins might be a good idea too in the beginning, and you can start offering them a bit of boiled egg too. The water should be placed in a shallow bowl with marbles or pebbles in it, so that they can't drown. But don't rush taking hatched chicks out of the incubator, they will actually encourage the unhatched ones to fight harder to break their shells. The brooder should be kept at about 90 degrees in the beginning, dropping the heat 5 degrees every week (this is just a recommendation, they will survive in colder, but better to not push your luck). Also, be sure to have a plan for any roosters you might hatch, chances are half are going to be boys. How many eggs do you have cooking there? Oh, and don't worry if they all don't seem to hatch at the same time, sometimes it takes a bit longer for other eggs, and even day 25 hatches are not unheard of.
Remember to post pics of your chicks, and good luck!