Here's (possibly) the best advice I can think of:

Try and speak the language as much as possible, to as many people as possible!

People generally appreciate the effort and many people will be interested in the idea of cultural exchange. English is a huge asset and can be used and exploited! 

You will make mistakes but learn to love them: they will be what teach you: the more you make, the more you will be laughed at, the more you will never want to make the same mistake again.

Oh, and have a sense of humour!