The trick is to learn High German & not worry too much about the Swiss German until you have been here for a while. My wife is fluent in our locl dialect, but speaks High German pretty much all the time in shops, restaurants etc. A littlle different when she is with her friends ...

For me, who was completely new to the German language when I came here, the only solution I found workable was to get the basics down pat & practice as much as possible. Watching films in German language with English sub-titles is also a good traing method & vice-versa. At the end of the day, it's all down to common sense & effort (along with a little bit of courage) but you will be fine.