"Russian is classified by the Defense Language Institute as a “category three” (out of four) language in regards to difficulty of mastery by native English speakers, and requires learners to devote an estimated 780 hours to highly-concentrated instruction to reach an intermediate fluency. On the Foreign Service Institute language difficulty scale, Russian is classified as a ”category two” (out of three), language, with significant linguistic and cultural differences from English."

So it’s not easy, but it is doable. I’ve done it, and so have some other people who post answers on this site.

For me, some of the hard things were:

1) learning the grammatical case endings – and, in particular, learning to be quick enough with them to use them in speech;

2) when I was first starting, learning the conjugations of verbs, and then later learning to use their perfective and imperfective aspects;

3) learning which prepositions to use in certain circumstances (for example, there are 3 different prepositions which all translate as "from");

4) using verbs of motion properly with their different aspects and all of their prefixes.

You can master these things, though – don’t give up!

It is annoying hearing US people speak Russian and messing up the R sound..