from our experience, we visited friends a few years ago and started looking while we were there, the first visit we came home feeling disappointed because we got no job offer, the 2nd visit again the same, but I had an interview where they wanted me to start sooner than the paperwork would have been sorted, so no good.
I kept in touch with the guy who interviewed me and last year we went over there again and the guy who interviewed me previously picked us up from the airport. We went over last year as a last attempt to find work, but unbeknown to us, the guy who picked us up from the airport (who also interviewed me the previous year) offered me a job there and then working for his new company...
I think a recce is highly recommended and network with people.. and just cold call and put your resume's out to everyone... that's how we started.
We are still not there yet, but fingers crossed we will be before the end of summer :
Good luck!!