I thought it would be helpful to list common mistakes newbies or even experienced veterans make.
1) Getting validation from the game.
2) Analysing the game too damn much.
3) Becoming a frame control freak.
4) Reading about cocky+funny and becoming an asshole.
5) Taking the game too seriously.
6) Not taking action until everything seems perfect in your mind.
7) Using manipulation (read: being a nice guy who hides his desires in order to be liked).
8 Focusing on the girl, instead of being who you are and not compromising your integrity.
If you guys have any more, just post them here.