Fixing the pay gap: turns out all we have to do is ask

CNN and CareerBuilder.com put out an oh-so-helpful guide for women on how to earn more money: ask for it.
I agree that part of the reason that women aren’t getting paid what they should be is that they may “lack the confidence to ask for more or because they fail to recognize their own self-worth,” but it’s not the driving force behind the pay gap.
And I certainly don’t know if it warrants a hokey step-by-step guide like this:
Step one — Explore your beliefs: Miller encourages women to examine their beliefs about why they are not earning as much as they would like. She says that “In many cases your beliefs are what brought you to where you are today.”
Miller says that to attain what you truly desire you need to break down negative programming you learned growing up — those that made you feel that you were not good enough, or strong enough, or intelligent enough.
Step two — Take care of yourself first: Women are far more likely to think of others first. “I tell women to stop taking care of others and take care of yourself,” Miller says.
They may be concerned that the timing isn’t right to ask because the company is going through financial difficulties, or may be afraid that it might seem selfish or greedy if they ask for more money. “You have to learn to put yourself first. This isn’t about being selfish, it’s about getting paid what you are worth.”
It goes on with some useful info, but the Oprah-style language is too much for me to bear.
So how much of the wage gap can we really attribute to (blame on) women and their supposed inability to know what their worth?