Having stayed way too long stuck in the fs2002 world(due to serious HW limitations), I became very adept at making fs2004 planes function in a world they inherently didn't like. And like Stefan I would spend whatever it took to "get 'er done," but on rare occasions the trash can was the only option.
Now that I run FS2004 on a kicka** PC, I can spend the vast majority of my time loading and flying which is so cool. If a particular plane acts too silly, I will spend a few minutes fiddling with it, but no where near the time I'd invest in FS2002. I have a very short fuse nowadays as there are sooo many planes that work perfectly outta the box -- so to speak.
The changes I make now are to enhance an already flyable bird to suit my preferences, not to make it work such as; specular shine, lighting, smokey bits, tire pressure, effects, etc. That stuff is fun and the results are very satisfying.
So after all this "rational rambling," my advice is set your frustration level alarm very low and always keep the trash can near by. Then quickly move on to one of those awesome birds you know you love. In just a few moments you will remember why FS is so much fun.