hmmm... well i think most of the gals (either HGs or WGs) and mamasans/papasans who's in the business knows a little English. I think some of the bros here had also experience that communication barrier and that includes me.
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. I speak English, very basic Cantonese, and absolutely no Mandarin but still manage to communicate with the gals.
Just be patient bro, be nice to the girls, even there is some communication barriers between you and the girl doesn't mean you will had a bad experience with them.
Smile Penis and Money... as what gwailoplayer advised us, that is what you really need.
and don't forget to read, read and read useful things on this site. it really helps alot.