salam, learning how to read and write is not difficult.there have been many converts that can get to the level of reading and writing the letters so that they can read the quran.

but learning the arabic language ie grammar and understanding and formulating sentences and speaking is VERY difficult and takes a lot of patience and effort. but it can be done.. just check out HY and others :)

well, I was born fluent in Arabic as well but I was a Teacher's Assistant in 2 beginners' Arabic classes as well as a tutor at the University of Houston, and i don't think it's as difficult as some make it sound. There were students whose ages ranged from 18-45. They learn pretty fast if you teach it the right way and it needs A LOT of practice. Inshallah, you can do it :)