Honestly, from the research I have done, it isn't too bad if you don't mind getting messy. The hawkmoths are real messy and real big. They only live for a few months, but at the same time you don't want to have more than probably 4 at one time since they are so big. They lay thousands of eggs at one time, and it might be overwhelming for beginners. Again, I don't know a whole lot about the subject but I did a little research on it yesterday. The moths feed out of a hummingbird feeder and they fling excrement and dirt outside of their cage.
There is a thread on here telling all about how to breed them, and I will look for that tomorrow unless someone locates that thread before me. It's got pictures and instructions and basically the place where I got most of my information. I think it would be a crucial source in beginning the breeding of tomato or tobacco hornworms.
I forget how long the eggs take to hatch, but I want to say a few weeks to a month or two. I totally forgot, so don't quote me on that. Hopefully that helped just a little bit. I will look for that hornworm breeding thread ASAP. If you search 'tobacco hawkmoth care' the thread might show up. Good luck.