1) Learn to think of nothing.
2) Find every single fault in her. See the beauty in other women. Take the piss out of her (in your mind) because you've placed her on a pedestal and you have a lot/too much respect for her at the moment. You need to devalue her in your mind.
3) Ask yourself if you only really want her because she is unavailable.
4) Keep yourself as busy as possible to take your mind off her. Playing loud music helps drown out thoughts, and almost helps to "play out" emotions so they're easier to handle.
5) In your mind, play the situation over and over again of her turning out into someone you don't get along with, or things not working out i.e. in the scene you get into a relationship and everything fails because she does keeps doing something unattractive. You have to have control over your mind in the first place though in order to do things like this, as in, if you're prone to depression or looking down on other people - don't do it. You've got to be able to stop negative thinking if it goes too far. If you do no. 2, you can develop a powerful mind that's very in control.
6) There is no such thing as "The One". Think of previous relationships where you no longer have any feelings for those people, and apply it to the current situation. You will get over her.
7) Identify everything annoying about her, or potentially annoying things.
8) For all the good things you see in her, identify them in other people...as many as you can. Don't give up on this and think, "Damn it, she really is better than everyone else"...because she probably isn't.