Your command and understanding of the grammar of your native language puts a hard limit to how well you can learn other languages. This has not been stressed enough and schools have all but given up trying to teach children grammar because as natives they more or less get along without it.

Georgian is really interesting. Very few cognates for non-modern words. Colors in Georgian are fun: you don't have "brown", you have "coffee-color" (ყავისფერი / ყავის ფერი); you don't have "light blue", you have "sky-color" (ცისფერი / ცის ფერი).

I've been told that western European languages are easy for Russian speakers because you can learn them by removing parts of the Russian grammar. "Oh, they don't have A, and B and C are the same thing for them, and they don't have D too!" Is that correct?

It's a little bit like moving from Italian/French/Spanish to English, except that English has some tenses with no direct equivalent in those languages and a ton of phrasal verbs to learn, but that's vocabulary and not grammar.

Well, just as Nabokov said: Russians have an impression that foreign languages are simpler than Russian.