By my count, you are at Day 23. So, your chicks are hatching late, and may have some issues since something about the incubation conditions was not optimal. A delay in hatching most likely means that your temperatures were a bit low. There are experience hatchers who make safety holes and intervene if they suspect that there is a problem. I myself have seldom successfully intervened so I’m pretty cautious about trying to help. If you do want to help, then working from the air cell end is the safest. Hopefully someone more experienced in intervention will happen song and guide you. However, you might want to keep your hopes dialed down as the lengthy time of hatching may mean that the chicks are stressed and unable to handle the difficulty of adjusting from living in an egg to hatching and living as a chick. Incubation conditions are fairly rigid, which is why people often are vigilant about using externally calibrated thermometers, hygrometers, etc. Your first time hatching in a new incubator might be a trial run to figure out how it can work for you. I bought a replacement incubator last summer, and my first hatch was a disaster; only 2/12 chicks hatched because it was too hot. I discovered that my incubator had hot spots that affected the embryos, even though I did have an externally calibrated thermometer. I really felt bad about the embryos that didn’t hatch, but I made adjustments and successfully hatched several batches of eggs afterwards. Best of luck with your hatch.
yay babies!! Ya we have lots of illegal fireworks here too and my dogs are such fraidy cats haha 
