Practice it at home. I use it daily, especially when I am trip planning, like now. Many of the Romanian websites I have visiting are in Romanian only. I can use Google Translate to translate the whole webpage or highlight snippets of text and translate those. That will get you used to working with it.
You can do the same thing with your phone. Find a recording of a foreign language on TV or your iPad, then pull up Google Translate on your phone, start playing the recording and tap "Conversation" on the GT app. It will then translate that conversation for you. Or you can type in sentences and words, and it will translate it for you. But start doing it now so that you will be proficient when you go on your trip.
I had an interesting experience with Google Translate in Germany, when I was trying to talk to a bus driver who was Italian. His German was limited. I speak German, but mine is limited as well. He was trying to tell me something (in Italian) that I couldn't understand. And I was trying to tell him that I knew the bus wasn’t ready to leave and I just wanted to wait there. But he didn’t understand. So he started using Google Translate. But the problem was he was using it to translate his Italian into German (not very successfully, I might add). He evidently did not realize I was American.
I finally managed to get my German through to him so that he understood what I was asking. He had a lightning bolt moment, said yes, and I got on. It was quite the debacle!