Your prison cell is empty
The difficulty is that the thingy that wants to cause freedom is the thingy that's standing in the way of freedom. That which wants to be free doesn't exist in the first place and so can never be free. Since you are not the person, no person gets liberated. Since you are Awareness, and Awareness is already freedom itself, Awareness does not get freedom either, and so we can't really even say that Awareness becomes free of the person.
Oddly, it's just a false notion of personhood that happens till it doesn't anymore. The belief in the prisoner simply ends, and along with that, the suffering implied in that belief. The experience continues, but there is nobody experiencing.
Hencely, all efforts to bring about Self Realization are futile. Thoughts are arising spontaneously and nobody is causing them, and so the belief that they can be controlled is based on the false assumption that there is a controller standing apart from the thoughts themselves. Isn't the thought to control,one of the thoughts that needs to be controlled? Within these spontaneous thoughts, an imagined person forms who stands at the doorway and waits for the next thought to come through. It can't know there is a thought until it is already present, and then it is too late. You may chase that thought around the block or you may not, depending on your conditioning, but you cannot prevent it without perpetually holding the thought in your mind that you are watching for the next thought. If this looks like a still mind to you, it is a delusion.
A still mind does not come about through any kind of control any more than surrender comes about through a choice. Mind becomes still when it no longer sees any point in running; when it's easier and makes more sense for it to just sit down and shut the hell up for a minute, and this is a matter of understanding. Surrender happens when it is seen clearly that the struggle is futile and self destructive, not when the imaginary person decides it's time to surrender because that's how it can get what it wants. Look back on the times that surrender happened and notice that there was no person involved to either accept or not accept; the person simply failed to show up on the battlefield. What would it take for you to miss your appointment with suffering?