I don't think that many game fish are legal to take with a bow anywhere.
Catfish is one that can be taken in KY, I think, but I haven't heard of bass being on the menu.

As a genreal rule, if there are size or creel limits on a particular species, it cannot be taken by bow. You can't put back one that is too small once you blow a hole in it. It's definitely not catch and release.

Bowfishing is ussually restricted to the types of fish that are overpopulated,underutilized, non-native, and environmentally harmful.

Is it hard?
Somedays it is.
It can take a bit of practice to get the hang of dealing with the refraction and learning to aim low to overcome it, but honing your skills is the most fun you'll ever have missing something. There is no substitute for watching a stuck fish zooming away with your arrow dancing along behind it. It's a rush, and bowfishingprovides lots of moving targets to keep things exciting.