How to do insight meditation as pain for the meditation object?

I'm soon getting my wisdom teeth removed. Like always, I don't plan on using any anesthesia for the procedure - the pain is probably going to be excruciating, like always. So how can I use it as a meditation object for doing insight meditation? The logic behind it would be that my mind would be entirely hyperfixated on a single sensation, distractions subsiding completely due to the lack of spontaneous mind moments caused by other sensations. Firstly I plan on investigating on how my mind reacts to pain, constantly self-reflecting on all the intricate mind mechanisms related to it. This would prove insightful in getting my mind to give up resistance to the pain, which is something that would be practically impossible for me to do at an intrinsic, fundamental level, but somewhat possible to accomplish at a concious level. Afterwards, I plan on investigating The Three Characteristics directly in the sensations I'm experiencing related to pain. This, for me, is the most confusing part of insight meditation. How exactly does one notice The Three Characteristics in sensations? How are you supposed to realize that everything is transient and ephemeral when the pain you're experiencing is excruciatingly constant? How are you supposed to meditate upon no-self and unsatisfactoriness? This question isn't limited to the context of the post. I'm genuinely confused about what they mean, and I would be deeply grateful to anyone who could answer my questions.