I think Cyrllic is trickier because... The letter differ from Romance/Latin languages.
You got the western font -- Capital, lowercase.
Cyrillic typed font -- capital, lowercase
Cyrillic handwritten -- capital, lower case
Then the way people actually hand write it. I'm looking at you zhe.
And then the pronuncation is a little different than Romance sounds. It's got the softening. (Who's knock? Meeyehki's knock.)
And then there are the letters that are similar to English but have a different sound. Like P, R, L, etc. M and t.
And the confusion from what Meeyeki's knock and tvyordi's knock actually sound like. A "yi." But there's also shcha.
I'm more interested in being able to read it so I can tell what's printed on the music. I need to be able to hear and speak it a little too though. It's not just printed text. It's got sound attached to it.