Cleomummy- yes, I'm very nervous at interviews but it was really straightforward.
I had done voluntary 'helping out' work once a week for six/eight months (whilst son at preschool) beforehand, so the head knew me. The interview was short and I quite enjoyed it! Had to 'teach'/lead a short session with half a dozen year one children, read a story, did a connected art session. It was fine! Sure you'd walk it if you have taught already.