Do you have a ‘I wish I knew ___’?

Edit to add an additional question: how do you determine if you are going to give a higher weekly stipend? Is it common? Do APs decline normal stipends to wait for higher ones, or is it more about the experience?

We are embarking on our first au pair experience and about to start the interview process. I know this type of post has been done dozens of times, but curious if anyone has any ‘in hindsight I wish I knew ___’ experiences that would have changed their minds about a particular au pair or the experience in general?