Matching up lines is trial and error if you know what part of the texture map is for that section on top of the F-18. Just keep moving the parts of the logo up and down until you are close, then just go a few pixels at a time until you've got it. I'm not the best, and it may not be the easiest, but it works for me.
-BrandonPS: Looking great for your first repaint! [smiley=thumbsup.gif]