Won't make it harder to learn, or speak but will make it harder to annunciate but most natives of any language are able to understand even if you speak poorly
Of course brudda, keep learning and trying. Don't be discouraged. Most natives, me included, get excited when they hear a non-native speaking their language and think its dope. They won't care about the level you're at :)
Not really, a lot of people learn the language without rolling r´s, you´ll have a very thick accent as a result but shouldn´t be an issue communicating