Hi there. Lucky for you I was just starting to sand down my 737.
The best way is to go across the fuselage, port-stb or vice versa, depending and try to follow the curvature of the fuselage too.
The wrong way is to go along the fuselage length from stem to stern or again vice versa.
Then just scribe back the detail if it is lost.
This works for us...hope it does for you
