No exotics myself yet, but moved to my current state largely so we can finally own some exotics ourselves instead of just working with them. I'm not even kidding when I say that was one of the top criteria for choosing a state. Kookaburras are near the top of my wishlist. How I love those glorified kingfishers!
Find out the species of hornbill if you can, and then post back. We had several species, but say, one of the ground hornbills have very, very different personalities and needs than something like a Von der Decken's Hornbill. Like Rosa said, depending on species, that is definitely another one you don't want to mix with ducks. Had a wild mallard fly into the pen of a Southern Ground Hornbill one morning, and they ripped the duck's bill completely off its face. Had to euthanize the mallard. Can't imagine the smaller species doing that, but definitely some can/will eat eggs/ducklings. We kept one of the red-billed species in with Temminck's Tragopans without incidence if that helps.
With a breeder close by, I'd ask to help him out with work at his place and see how you like the mannerisms of hornbills. That'd be a great opportunity to learn all about them, their care, and their breeding. I loved all of the hornbills, but I've met several people who were just rubbed the wrong way by them. Small species can run under $1,000, and the Von der Decken's seem especially prevalent right now.
Keep researching and getting ideas like you are doing. Looking at breeders nearby is a great idea as many are happy to coach people new to the species.