I don't like this type of question. In my experience knowing one language has little impact on learning another. What matters much more is understanding the underlying concepts.
If you grok OOP it doesn't matter if you go from Java to C# or from C++ to Python. Yes, there are differences, but they're mostly syntactic in nature.
So assuming you got the hang of imperative programming and maybe had some exposure to functional programming, too, the concept you're likely to struggle with the most is ownership. Simply because it's a concept that's fairly unique to Rust.
Having come from Java, via C++ and Python and having dabbled with Haskell a bit, I feel like The Book does a decent job of explaining Rust in general and its oddities in particular.