If you read anything by EA or taken some of his courses you will occasionally see reference to dropping mind. It is a fundamental skill wherein you silence the verbal chatter and daydreaming mind. It is a skill that you will use for virtually everything that you do. I would like to share a meditation of sorts that will teach this in a very direct manner. It is very simple and yet very powerful.
With this, you simply relax and become aware of yourself as an observer existing behind your eyes. From this vantage point simply gaze out into the world around you. You may notice that if you are daydreaming or have mental chatter going on that your vantage point has shifted. You are no longer behind your eyes. Simply returning your focus to being behind your eyes has the immediate effect of silencing the mind. Work on extending your time being behind the eyes to longer and longer periods.
That is it in a nutshell. A few points on this. This is not a trance meditation. In fact it will have the effect of giving you extreme lucidity and clarity in this world. As you master the technique you will be able to do this anywhere, even while doing mundane tasks. This lucid state, once sufficiently mastered, will be used in everything you do. With divination and communication with spirits you will become a clear channel for information. With evocation, you will be employing the magickal imagination instead of the weak daydreaming mind. This lucid state is also used in soul travel. So while this meditation focuses on the physical realm, this skill can be carried over into altered states of consciousness as well. Use it. Master it. It will then become second nature.