Earlier quoted context omitted.
Your butt goes deep enough into the chasm that splash only falls into the bowl, never outside. If it does, you're doing it wrong.
But how do you achieve that with those hand-sprayers? And don't droplets of black water fall all over one's hands and the sprayer when doing so? The whole thing just seems awful to me. I know, I know: I am the ignorant one. The rest of the world seems very happy with them. But I just can't figure out how to use one in a sanitary fashion.
When people say bidet, they don't mean hand sprayer. They mean a Toto which is setup to spray a jet with a diameter of like a couple millemeters at a fairly low pressure at just the anus. If it misses the anus you now have a slight bit of water on your butt cheek.
It's gentle enough that there's not much of a splash. If you're sitting correctly the black water won't run 'down' your body it will fall straight down into the bowl.
There really isn't a learning curve.