1. read periodicals. not tabloids.
2. speak to yourself in the mirror using english
3. try not to add the "twang" in your accent unless you want to sound like a trying hard person. try not to be sassy unless you want to sound like mommy D.
4. listen to commentaries or videos, look for tutorials. follow them as to how they speak a word. one by one, then as a phrase then sentence.
5. in your posts here, try to speak in english. then re-read your reply/post before hitting the post button. look for any grammatical error or something that doesnt sound right.
6. read. read. read a lot.
7. research for the country's dialect, what are the usual phrases they use, euphemisms, etc.
8. it doesnt have to be perfect, what's important is you are able to comprehend and what you say is understandable.
well i hope that works.
Good eye might. (if you get this right, you're good to go)