Hi! Not easy. Not a good place to go to with English only. Though there are a fairly scarce market for such visitors. American Language Centre, they employ native speakers, and they don't require qualification, and generally native English speakers' best chance of finding a job there is mostly with teaching, as far as I know (i just realised, i'm not very knowledgeable in this matter). But wages are very low. (Prices too)
Regarding communication: a lot of people are speaking some English, especially among the young ones. You should make some friends there while not there yet. Assistance is highly recommended. Good luck.