They wont automatically be hermies. As long as you dont stress them out too much they shouldnt be herm.
Umm, that is all of the above, depending! Some strains are hermie prone. They may or may not hermie under certain conditions. You'll need to be careful. Mostly, though, grow them right and they will treat you right! I have a hermie philosophy.... A few seeds per plant is fine. Lots are not!!!