I think Marco's method is the easiest for me to do. Have used it many times, with good results.
http://www.abarnyard.com/workshop/timing.htm
I think you have to do both. When I fiddle with the timing, the first thing I do is check the point gap, then adjust the rotor position if necessary. But then again, I'm really rather mechanically challenged! My Model A's do seem to run pretty good, though (most of the time)!3 different people suggesting Marco's site (it's good stuff Tagroff!)...
But is Tagroff asking about timing, or about setting points?