It's really best to learn how to do it by hand. That way if you install something that doesn't work or that messes up FSX you will know exactly what to do to remove it. No two airplanes are exactly the same and auto installers will sometimes put things in the wrong places or overwrite files that shouldn't be overwritten. When that happens you are screwed if you don't know what files went where. It could mean the difference between just removing some files or a complete reinstall of FSX and all your addons.