>This is the first time I've seen a Great-horned owl, so I could be
>wrong, but it was genuinely huge and had those two horn things over
>its eyebrows.

Oh, it's a great-horned, Bob. No chance of being wrong given what
you've described.

Don't worry, your first won't be your last. And you'll never tire
of these guys. They've got a subtle beauty and majesty that causes
even long-term birders to look (at least when no one else is around!)