be careful to not be OVER-confident. Let me give you an example. I play chess then after some time I get a significant advantage by taking him few pieces from his mistakes, then now I start to feel great and relax, then start to get lazy or play faster because if I make a mistake then whatever I would still have my advantage but BANG surprise, I started neglecting the field and then I made a terrible move that is making me in a serious trouble, etc.

Keep your confidence in check, always make sure you are not neglecting the basics and that you still listen or read or ask questions about this. When your are over-confident you start neglecting, then don't read anymore, don't listen anymore, etc and eventually you screw up.

Having a girlfriend is great but keeping them is something else.