Hi Malcolm, there is no real easy way. I would make sure that before you start that you make sure that you are 100 percent level and inline with the screen.
Beyond that, it’s just a matter of throwing up a 16:9 image/frame that allows you properly zoom the image then align its horizontal and vertical shifts.
The big recommendation I would make is to try at all costs to avoid the keystone adjustments. Sometimes with keystone adjustments you’ll find that you fix one problem and create another.
It sounds like you have a pretty straight shoot so it shouldn’t take anymore than a few minutes to use your horizontal and vertical adjustments.