Invariably the anticipation and waiting is far worse than the inspection itself. Don't prepare any paperwork for the sake of it. Ofsted tend not to look at much paper these days. It's highly unlikely you'll speak to any inspectors. They will be far more interested in talking to pupils and they will usually select the pupils to speak to. If your role involves collating data on exclusions, detentions, rewards, your HT might ask you to summarise things so s/he can present information in a self evaluation or as information to inspectors but these days, schools usually have an electronic system for this. It's possible that inspectors will be trailing some pupils, perhaps SEND pupils and want to know background details of the pupil. This might involve a short talk to you but it probably won't happen. Your SMT will definitely know the pressure staff are under. Multiply it by five and that's the kind of pressure they will be feeling when there's an inspection. I kid you not.