Ok im sorry if these questions have been asked but I didnt feel like reading througb 477 extra pages

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Ive never hatched eggs before, I was considering venturing into incubation this year and decided to wait another year on that. I did however doscover a broody hen last week and thought... y not. So I grabed 2 dozen random fertilized eggs from down the road and put them in her favorite nest box. Shes going on day 5 of sitting on them so it seems like shes in it for the ling haul but this being a whol new venture for me I have questions about how to handle this.
I do want to candle on days 7 and 14 to try to get rid of duds that may expolde and remove my other hens unfertilized eggs, but how do I know when this girl will be taking her daily break for food and water!? Im worried about just nudging her out to check them bc I dont know of that could hreak her broodiness?? Is that a possibility or legitimate concern?
Also shes up in the nest box which is all fine and dandy I guess until they actually hatch right? I shoupd move them before hatch so they dont fall and get hurt once they hatch? If so when is the least detrimential time to move them? And how do I attempt to make it less stressful on mama and less likely to break her broodiness? Should I just close in the besting box the day they are supposed to hatch and move them after they are born?
Also, if id like to keep them in the coop but seperatef from the rest of the flock (hopefully making intergration simpler in the long run) how much space do I need in the enclosed area for mama and each baby that makes it? Our coop isnt very big so im working with limited space.
And lastly we have verl little predator proofing in the roaming area so id like to keep them in the coop round the clock while theyre still small but at what point should I be able to let them co-mingle with lesser chance of getting picked off by birds like crows and such?
Sorry for the mouthfull! And thanks in advanced!