What is "Do what thou wilt"?

Thelema is not about labeling oneself.

The term "Thelemite" is only used once in the Thelemic Holy Books when it is said, "Who calls us Thelemites will do no wrong, if he look but close into the word." (Liber AL I:40) It refers only to others labeling those who follow the Way of the Crowned & Conquering Child...

This same line ends with the eleven words, "Do what thou wilt shall be the whole of the Law"

"Do what thou wilt" is negative & destroying in the sense that it cuts through all

• Morality (as an a priori truth) [AL I:40; III:60]  
• Dogma (metaphysical sophistry as binding to our Going). [AL II:27-34]
  

But it is also positive & creating in the sense that

• it inherently leads us to the ancient injunction, "Know Thyself"
• This is the Great Work wherein we come to know ourselves as Ourselves, without limit and infinite.

 

We must perform the operation of Solve, dissolving into the formless Unity which is Naught, so that we may consolidate our Will in our Way, Coagula. In this, each moment is a new Sacrament, and a new branch of Joy. [AL II:9, 42-44, 66]

Then - being "chief of all" [AL I:23] - the Child of Thelema works her Will, guarding against the phantoms of Morality and Dogmatism with the merciless red flame which is as a sword of Ra-Hoor-Khuit [AL III:38].