Tamil - How tough is it (for an English speaker)?

I have a potential opportunity to move for a job in Sri Lanka. Not sure I want to take it (the job/move to Sri Lanka) as Tamil is not a language I have a huge interest in learning and I would be expected to use English there. Anyway, for those of you with some exposure to it or to other radically different langauges to your native ones, how hard do you think it is?

(If it helps to judge my possible abilities in language learning, in non-native languages I have Conversational/Intermediate French and low-level conversational Polish)