Nothing is more obvious than the perspective that opens in any sustained intentional action, in willing some end, and which separates you as the doer from the thing to be done. For this opening to be a valid evidence for something, say loosely metaphysical, then the difference of doer and prospective deed ought to precede the engagement in the act. Indeed seen hastily it seems to be that way, but if you look more closely it is the other way around, the action, or whatever it is that brings about the intention comes first and the doer, the one here who has willed the act comes after, is a normalisation of the event. In fact you find that it can be dispensed with completely, along with the perspective that frames it. It turns out to be no more than a sort of friction, the action proceeds more easily without it.