Aint it great when they hatch and you have chicks, where before you had none? How does it make you feel?
There is one word that universally applies to chickens: Vigorous. It should be your watchword in all things dealing with them, especially the hatchout.
Usually when a hatch is early it is because the temps ran high over the course of the incubating period. I've had them come in early, on time and run over, too. There are no absolutes.
Most hatches that are incubated properly
will have what I call "sooners," one or two that come in sooner than the rest. These fairly burst from the egg! Then there is a rush of "breakouts," the regular hatch. Finally, there are the "weakers." It is usually the late hatching weaklings that dont survive and often enough just drag out til they expire. But it sounds like things are doing fine for you.
Should you help them hatch? Depends on you. Sometimes I help those that are egg bound or straggling, but vigorous. On the hwole, I tend to be a hard-liner. I say those that don't make it will:
1. Be weak and wimpy.
Like anything, you can nurse a chicken if you want to. They might live.
2. Probably succumb later.
So often the wimpy ones end up dying. They are usually the ones the others mercilessly pick on, too, often to death.
3. Pass on poor hatching traits to any offspring, should they have them.
This should concern you, even if you only want a few birds.
It's up to you, but read #3 again. The weak hatching bird you allow to live today, might breed tomorrow. Nature burdens the chicken with enough... adding bad hatching traits to a strain is foolhardy. In almost every case sharp, quick hatches that result in vigorous chicks come from good, selective breeding. Hatch survivability (# of surviving chicks after 3 days vs. # of eggs set) and sharp hatchouts are what I look for. When I talk to a breeder, that is what I want to know first. The opposite, weak hatches that take forever, are most often found when the owner is inexperienced and follows poor management practices.
To some, my attitude seems ruthless. To others, sensible. Do what works for you, Dave. Since it's your first hatch, help as many as you can - it's a good learning experience.