I wouldn't worry too much. Get your brooder set up and running. Once your first chick has hatched, you are safe to leave it in the incubator for at least 24 hours. Some say 48 and some say 72. Remember in the US, they post day old chicks with no food. They have plenty of nutrients in them to survive without food or water for probably 3 days (pushing it in my view). The key is not to panic. If you have hatched chicks and eggs still pipping, it's often better to leave it alone and wait (keeping in mind that you maybe need to get the first chick into the brooder within 48 hours). Opening it up to get fluffed up chicks out can often lead to a sudden drop in humidity and 'shrink wrap' chicks who have pipped or unzipped. That is, their membranes dry out and they can no longer move enough to unzip the egg. If there are no eggs pipped, then go ahead and get any fluffed chicks out then seal it up again, adding a damp cloth if you like to up the humidity.
If you do get a chick who has pipped, or partially unzipped but is stuck, again, don't panic. Remember it's got up to 72 hours from the time it broke the membrane before it will be in trouble. Best thing if you see an egg that is partially open with a leg or beak out and nothing further is happening is to sit on your hands. Wait 24 hours and then consider helping it out. Going in too early will likely do far more damage. Once it's been pipped for 24 hours, remove it and get a warm tap running slowly and some kitchen towel. Gently remove the shell bit by bit, wetting the membrane with warm water. Go slowly and once you have all the shell off, try to wet the membrane and 'roll' it off the chick. Use plenty of warm water, get it cleaned up, especially it's bum if it's been in there a while as it may have done something. Then once it's all clean, pop it back in the incubator until fluffed.
Some people think that if a chick can't get out of the shell, you should leave it. But I'm of the mind that by using an incubator we are creating an unnatural environment anyway so you sometimes have to intervene. The fact is that a broody hen in a manky old straw nest under a bush will beat us every time for hatch rate.
Hope this helps.