I've not done australia but I gamed some aussie girls in thailand, I've done america and I honestly found both easier. I guy who wings for me is australian and he finds it easier over here, but I think thats mainly because of the novelty of him being australian. I think you'll probs find it easier, people might bust on your accent now and then but sets will probs fly open. Just search for a forum for over there, theres a forum for most major cities. Or ask around on an international one like RSDnation.