Wolf just reminded me of another rookie mistake. I got stuck at the gold saucer... for like a year. I parked my tiny bronco near the mt.corel trails that lead into barrets home town. I would go outside and see my tiny bronco parked... I just couldn't get to it.
I asked my friend if he could help me cause all my characters were level 99 but I don't know how to get out of my town. He played for like 15 minutes. When he got to the screen with the bridge I took the controller away from him and told him he had to go home. Needless to say the rest of the game was easy.
In Final Fantasy XII I made the rookie mistake of opening a damn chest that for some reason, needs to be left alone. The only real mistake I did was try to beat that game without a guide.