I have a 50 Merc and I installed the stainless trim before installing the window. It wasn't easy keeping everything together but take your time and pay attention. Then I moved the completed assembly to the car and did the string trick and had it installed in 15 minutes. I had never installed any glass before but I asked at a glass shop and they told me how to do the string trick and it works slick. I had my brother help because he was pulling the string inside as I was seating the seal with the heal of my hand outside as we worked our way around the window. Good luck!