Are there two pieces? If it is one piece you will have to saw itin two. A band saw is the easiest way. I use a wooden sled to saw bone and horn.

How thick are they?
How long are they?

Looks ok to me. I use a heat gun and weights to flatten horn. A hair dryer should work. Hot horn is very pliable but not for long. Have your "press" ready to go when you heat.

Good luck