If you know the dimensions of the aircraft, then you can get a close estimate of where they go. If I don't know them, I move them one meter, to see how far it moves, then I can take a more "educated" guess for the next move. The hard part is the Angle of Incidence! If my scalp wasn't so tough, I would be bald from tearing my hair out over them (them AND figuring out the CS 3D HUD).

I keep a pen and paper (Windows Notepad actually) when making changes so as not to lose what I have done or which change does what and in what direction.

I forgot that I had given the information on Location and Angle of Incidence in a reply above (http://www.captainsim.org/yabb2/YaBB.pl?num=1297264482/226#226) to help someone else, so take a look at that for more help.