>how different/hard would you say it is compared to English and my native tongue
Pretty much the exact opposite in most aspects. Russian is regarded as one of the hardest languages to learn in the world. In all fairness, it's arguably the only one worth
learning out of those other languages due to them being irrelevant gookshit, and Finnish. The main hardship in learning Russian is the complex and intricate system of padeji or grammatical cases, as well as declensions. Imagine that every single object in existence has either a masculine, a feminine or a neutral form and you must know by heart how to instantly declinate it in a sentence.
>but I forgot that the accent heavily varies all across Russia
What are you talking about? Russian doesn't have accents. At best there's a slight "southern drawl" but even that is a stretch. Russian is specifically regarded as being universal across the entirety of the country, where anyone can fully understand each other, unlike most of Europe where there are insane accents and dialects across regions.
>Most people also don't speak entirely gramatically correct Russian
The fuck are you talking about? Everyone in Russia speaks grammatically correct Russian.