That's for sure! Plus, those dealing with metals were almost considered Gods - they probably had nothing to think about but to work metals - others probably hunted for them, build their houses, and so on. So they had a lot of spare time to practice with metals, thus gaining a vaste knowledge and technique.
And don't forget that, from childhood to the grave, they did that job. After some decades of practice, everyone would be able to make such arrowheads.
By the way, during the Rennaissance, there was an ironsmith in Florence called "Il caparra" (caparra is the Italian word for deposit, it was his nickname, because he wanted to be paid before beginning a work). This ironsmith was so good that Lawrence the Magnificent often asked for his works, and a well famed painter such as Il Pollaiolo (
http://www.storiadellarte.com/en/biografie/pollaiolo/vitapollaiolo.htm) used to prepare him some paintings, which Il caparra used as preparatory drawings for his iron creations!
Greetings,
Mauro.