I read on a wall today, this quote:
"BEFORE YOU CAN ACCOMPLISH A THING; YOU MUST FIRST EXPECT IT OF YOURSELF."
That is very true in my eyes. If you want to accomplish something difficult, the first thing is not just to wish you could. Not even to want to do it. And not even to believe you can... You have to expect it of yourself. Once you expect to win, you will inevitably start winning.