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I guess so. I know Finnish would be hard for me despite the familiarity of it's logic. I toyed with the idea of learning it but if it isn't a must I won't.
Indo-European languages are easier, if you know one it is really helpful with the others. Especially if it's a harder one like Latin. Or German, I consider that one a more difficult among them. I'm not sure about Slavic languages, they are almost a mystery to me.