The doctor uses local anesthesia before the wisdom teeth extraction. They put anesthesia on the part of the gum area where the extraction process will take place.
The best thing to do is to take plenty of rests to avoid dry socket after tooth extraction. No activity for the rest of the day would be the right thing to do.
The growth of wisdom teeth starts when youths reach their adulthood. From the time of 17-21 they start feeling the pain caused by the wisdom teeth and then it should be removed.