Requires no skill
It’s all about repetition and experience with that certain situation or against that specific profession/build.
But most hardcore Pvp’ers grasp it easier and easier once they understand both sides of the playing field. It becomes Pvp intuition.
Intuition, a phenomenon of the mind, describes the ability to acquire knowledge without inference or the use of reason.
Thief takes more than a modicum of skill with some builds, and no I don’t main one.