I get to know the children. I know the teacher. I talk to the children and the teacher. I do what I am asked to do. If I am asked for advice I give it if I have any to give. I do not judge the teacher's 'performance'. I do not think about what I would do differently. I suspend my tendency to opine.(!) If asked to assess a child or watch part of a lesson for any reason I do it. I keep to the dress code. I make the teacher a cup of coffee. I think that covers it all.