In all aspect we need to educate ourselves, we should not enter into a business or a certain thing that we don't know much of it, we have to learn about it first or else we will lose some part of it. But at some point, experience still the greatest teacher, so we need to have experience in ourselves.
Yeah, experience is the key in trading. Knowledge and intuition are important but experience is paramount.
In any case, experience only comes with practice, even if you know a lot of information and different nuances about investment. many professionals already intuitively can determine worthy projects and at the same time their blunder can be only 1 or 2%. it's all thanks to experience.