The only suggestions I can offer about this article are:
1) you do not NEED to candle the eggs. I didn't and 3 out 4 hatched just fine. I tossed the dud.
2) marking the eggs is a must. Moving a dedicated broody to a proper nest site will not break her. If it does, you might not want to allow her to brood. You will, however, need to watch her every time she leaves the nest to make sure she goes to the new nest site. You controlling when she leaves the nest by removing her in the morning and late afternoon will allow you to more easily monitor this.
3) if your broody hen is not regularly leaving the nest, at the morning feeding and in the late afternoon, gently remove her and set her down off the nest. Watch her to make sure she breaks the broody trance and runs off. If she doesn't, give her a "peck" to the neck and that will help her snap out of it. I've seen both the rooster and other hens do this to my broody.
You don't want her to stay on the nest constantly. She needs to stretch her legs and wings, eat, drink, POOP (nothing like a broody poop!), dust bathe and preen. As long as the weather is warm, don't worry about her being off the nest for as long as 1 1/2 hours. They eggs will be fine!