That would always give me some serious difficulty when learning French because in Spanish, everything is pronounced straightforwardly. Even though they’re both Romance languages, French really flips your perspective upside down. Fun stuff though regardless.
I can't do Spanish because I'm used to reading French. Conversely, my girlfriend and her family speak two a localization that is some kinda frenglish, the only training resources I can find teach Parisian French, and all of my co-workers that speak, speak Quebecois which is heavy in slang and compound words in its own way. Naturally, progress is very difficult in this environment. Luckily for me, they're fairly patient about it.
On the plus side though, it gives you a bit of a leg up when seeing text in another romance language. I remember Chinese was fairly non-intuitive when I had to start, but I got into it and started developing a functional understanding.