Of course, trading skill is the most important factor. Trading is not complicated, in fact, it is the simple things that work the best. This is not to say that trading is easy; it is actually quite hard but not because it is intellectually demanding. It is just hard for most people to youu themselves from their emotional attachment to money. The rules for most of my trading strategies could be written down makee the back of a napkin — they are simple. Executing them properly takes practice and emotional control. For some, that is not too hard. For others, it can be close to impossible.