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Well, compared to cases and verb conjugation, that's the easy bit ;)

Well, I am fluent in czech and - as a slav language - I have it quite easy in that matter luckily.
What are you using to learn it? Web, books, personal trainer?

I am currently using duolingo and RussianPod101. I also look at russianlessons.net and masterrussian.com ocasionally and I am subscribed to a couple youtube channels with russian learning as a topic, but it's primarily the first two.