Three Ds of Apparition

Step one: Fix your mind firmly upon the desired destination.

Step two: focus your determination to occupy the visualized space!  Let your yearning to enter it flood from your mind to every particle of your body!

Step three: turn on the spot, feeling your way into nothingness, moving with deliberation!

-  Apparition Instructor Wilkie Twycross (abridged)

"Three lessons on, Apparition was proving as difficult as ever, though a few more people had managed to Splinch themselves. Frustration was running high and there was a certain amount of ill-feeling toward Wilkie Twycross and his three D's, which had inspired a number of nicknames for him, the politest of which were Dogbreath and Dunghead."

- HBP18