To be fair I never had the cojones either but once you succeed at a pretty good level you’re realize you actually CAN do it and you can make the attempt.
I can tell you right off the bat: IMO Russian grammar is ridiculously simple compared to Spanish EXCEPT FOR the cases. Vocabulary it has way way way less cognates so every single word is a “hard” one to memorize. But otherwise I’m pleasantly surprised to find that although the initial zero-to-intermediate stage took three times as long as it did for Spanish and then French, it did in fact follow exactly the same path.
And I can in fact now understand Russian to a reasonable degree.
And I can speak it worse than Bald and Bankrupt but I can.
So it’s doable.