The desire to become enlightened is still you desiring something.
What happens is you start to touch places way beyond what you ever thought you were. Or you start to awaken, and it’s like the bliss is much more incredible, the understanding is more incredible, and so on, and the craving for it. It’s like a super crave and that desire is what is used to finish all the other desires. Then, near the end of that sequence, you’re left with only that desire, and you see that the desire for it is what’s keeping you from it. Then there’s the having to let go of the desire in order to become it, which is the final process of dying, really.
It’s dying in a psychological sense, because having that last desire is your final statement of who you are.
But the predicament is that who you are can’t go through the doorway. You can get right up to the door and you can knock, but you can’t go in. They say “it” can come in, but “you” can’t. That which desires to get through the door gets right up to the door, and then they say, “The desire’s gotta stay right out here. Sorry, leave your shoes outside, but you can come in.” At that point the desire falls away.