I have landed at Crystal River. Friend of mine is a pilot, we took off from Zephyrhills and flew to CR for breakfast. As was mentioned, in an uncotrolled airport you announce intentions, if there is another airplane in vicinity it makes them aware. Not necessarily a tower op.
When at LD I sold a nice coach the the guy that owns Crystal River Auto's, that big string along 19, an Eagle.
Then a couple years later went to work for him as a fill in. Really nice guy, and from what I saw in my time there, very above board. No shenanigans at all.