You can always buy the paint that changes colour where it shows where you have been, I have never uses it, but when I paint a ceiling, I work away from the window, the first coat is a doddle as you can see the difference, but can be tricky for 2nd or3rd coats.
I just roll it on, then cross over it, sort of overlap but in different directions, I suppose I am lucky cause I can see where I have been, my dodgy eyes are good for that type of thing.