Just shoot it a couple times with a crossbow with Traq arrows(About 5-10 shots) then feed it alot of berries(any kind is fine) but bring extra and bring narcotics(about 10-20 depends on the level) and make sure there aren't any other stegos around and if you want, go up on a rock(They are kinda slow) and if you are a newbie use Slingshot and shoot it at its head (and you are gonna need to stand on a rock)