Here is a picture of my NEW Toyota ONE DAY after I received it. I didn't think I'd need to go through all the steps either since it was new. Boy was I surprised. I started with Iron Remover (the picture) then foam cannon wash, clay bar, more foam cannon wash, Prep Spray and Ceramic Spray Coating. Then Ceramic Boost and Ceramic Waterless Wash on the glass because they streaked with too much Boost. Unfortunately it is white so you can't really see it. But I was shocked when I put the Iron Remover on there.
I'm a rookie and this was my first time do this. But based on my findings about two weeks ago, I'd do everything prior to putting the ceramic spray on your car.
First two are with the Iron Remover. Last two are the finished product.