And what about lvl-ing up yourself?
That is actually my main concern

On the wiki page it was recommended to use mercs with laser/plasma
so u can finish enemies.
p/s/ i'm SG with fast-shoot perk
p/s/ say, who would you take with you/buy to hunt centaurs?
Trappers can level only as I know I tried to let some other slaves kill stuff but nothing happened. For leveling them add to male ones a gun to females throwing knifes or combat knifes and hunt brahmins or molerats.