Speak English. The only way to take advantage of an English-speaking country is to practice with native speakers often, in formal and informal settings.
Enroll in an English language institution -- schools that teach English as a second language to students from other cultures -- which are often found at universities. Simply knowing how to speak English isn't enough because conversational English language can often fall below the requirements for business English. Language institutions know which methods work for people learning English as a second language. If money is an issue, some universities host free English conversation clubs for people seeking to improve their English.
Explore hobbies and make new friends who share a common interest. Attend a cultural club dedicated to your home country. A cultural club often includes people who are interested about your home culture, and in the process of conversing with them, you will learn more English. This leads to naturally occurring friendships, instead of seeking out friends solely for practicing English. You will feel more comfortable accepting tips and hints on your English with these friends.
Immerse yourself in the culture that surrounds you at all available times. Attend free lectures at local universities. Apply for a library card and listen to audio books so you can perfect your accent. Attend local concerts, and join the crowd in singing along with the band. The movie theater is a great place to immerse yourself in actors' lengthy conversations. Watch TV to see shows in English so you can practice English phrases at home.
Record yourself speaking English to assess any pronunciation difficulties. Borrow a pronunciation guide in audio format from your local library. Practice repeating popular phrases such as "thanks a lot" and "have a good day." Focus on avoiding transfer of pronunciation features from your native language -- for example, Spanish speakers commonly replace the "s" sound in English with the "th" sound.