You're welcome to try to get eggs out from a broody hen, but she'll put up a heck of a fight. You might want to get yourself a nice pair of work gloves to protect your hand from scratches and pecks. If you collect your eggs daily you should be fine, but sometimes even one egg in a nest is enough to make a hen go broody. If you don't want her to be broody, you'll need to put her in a broody cage to break her from broodiness so she can start laying again. If you want her to hatch chicks, and she's already setting on eggs, separate her and her nest and eggs from the rest of your coop. Put her into a brooding coop where she can set her eggs in peace (other hens might peck at the eggs, or might continue to try to lay where the hen is nesting). How many eggs depends on the breed of the hen, but three to siz isn't a bad number. Not too many, because then she won't be able to cover them all and provide them with the necessary heat from her body in order for the chicks to develop properly.