As far as skill goes, i think that it is 30 percent strategy, and 70 percent instinct/tells
By strategy I mean true correct plays that work in the long run, this you learn from poker books such as supersystem. However, when you are reading you should keep your mind open (usually the author will actually tell you this in the foreword of the book) to all the different exceptions in certain situations.
For example, in super system 1, Mike Caro says that you dont get paid to win pots, you get paid to make good decisions. He even goes so far to say that he tries to not win pots. At first this kind of makes me want to tighten up, and not try to bluff so much,
However, if the time comes where you know your opponent's weak, i think you should risk a good amount on a bluff to make him fold. I honestly think books are more of guidelines rather than a step by step explanation on how to play