3 – Memorize useful North American or British slang, depending on where you are, and current idioms and expressions, etc. to integrate them whenever possible. If you are not sure if an idiom or expression is appropriate, ask a teacher, tutor or coach, or a trusted native English speaking friend.

4 – Buy a pronunciation book. Check for CDs in the back and whether they are British or American English. Adapt to your environment as best as you can with your accent. 

5 – Use a mirror to observe your lips, tongue and teeth positions, and observe others for correct positioning. Practice in the mirror every day. A good time is right after you are finished brushing your teeth.