1982 300SD door panel installation

I am in the process of reparing the power window mechanism for the left rear door of my 1982 300SD. I was able to repair the window mechanism. However, now I am having trouble replacing the door panel. It was very difficult removing the door panel, especially over the door handle trim plate. I am realizing that it is even more difficult to reinstall the door panel. Specifically getting the door panel to snap over the door handle trim plate. Since the trim plate is bigger than the opening on the door panel it is very difficult to get it through the panel. How do I get the door panel back on? Although it doesn't appear to do so, does the door handle plate snap off somehow? Any suggestions will be appreciated.