A lot of guys around here seem to have the same attitude: that
VB is "easy" and like "stealing money."
In a couple respects, they are correct: officiating volleyball does not require officials to run or even move much, and that's easy compared to, say, basketball.
Also, the mechanics are simple, partly since movement is not required, and that's easy compared to, say, baseball.
The rules are, I think, much simpler than baseball's, so that's easier as well (although I agree with Felix that there are nuances).
What I've found challenging so far (and I'm a novice) is judging hits and keeping track of alignments. So much of
VB officiating depends on these skills, which I suspect take a while to develop. And this, it seems to me, is at least as difficult as judging advantage/disadvantage when calling basketball fouls.