Another aupair virgin here. Brummie, I am also convinced I am a poor judge of character.
I put an ad on the Great Aupair and Aupair World websites about a week ago and just today, made an offer to a French aupair which was accepted! Hope I don't end up moaning on this thread in a few months' time.
For some reason, I received hundreds of hits from aupairs in a few days. Cloudberry, I think it is because I live in London, like milkchoc. But some of these hits were pretty random - like the bikini clad/Ricky Martin sorts , those who were from Mexico, Indonesia whom I could not get a visa for, summer aupairs (even though I clearly stated I wanted a longer term one) ...
I was ruthless in pruning my list.
A handful of aupairs emailed me and I started communicating by email. I went for those that replied promptly and even answered my long questionnaire. I took keenness to be a positive sign - tell me if I am wrong!
Then I asked for references - Brummie, ideally if they have past aupair experience in an English-speaking country, you can doublecheck with their previous family. Mine did not but promised to get me one from her French employer which I will get my French friend to translate.
Again, I assessed how quickly they could get their references together - shows organisation and go-gettingness.
I also called the final one to assess her level of conversational English and get a feel for her personality.
Then I offered! [gulp]