I've gotten wisdom teeth pulled on two different occasions.
1) They'll most likely use lidocaine, novacaine, marcaine, or some other local anesthetic that ends with "caine." I guess some places could use nitrous oxide which is dizziness, then regaining consciousness some time later. The local anesthetic is injected along your jawline INSIDE your mouth. It doesn't hurt too bad getting it injected, it's just a second of pain, pressure, then numbness will soon follow. You won't feel a thing during the procedure, if you feel pain, make a helpless squeal. The dentist will administer some more anesthetic. The numbness will most likely last for the entire day but by next morning it should be gone. It'll be hard to eat, drink, or spit out blood that collects in your mouth. I recommend not drinking or eating that day. It'll be hard to swallow, talk, or smile. Do not brush your teeth until the following day.
2) The procedure involves making an incision, yanking your teeth out with pliers and a prying it out with spoonlike object. If you hear a CRACKING sound, don't be scared, it's most likely your wisdom tooth chipping from the dentist prying it. They then sew the cavity to the best of their abilities. You will have an open sore in your mouth for a few days to a few weeks. The tissue that fills the cavity need oxygen to survive. Bacteria, carbon dioxide, alcohol, and the lack of oxygen kills this regenerative tissue. Once this tissue dies, that open cavity will decay. That is called "dry socket." I hear it hurts a lot and stinks bad. Do not smoke, drink alcohol, or drink soda for the first few days. I'm going to tell you this now, food WILL get lodged inside the cavity. Food will promote bacterial growth inside the cavity. Rinse your mouth with water, and then a small amount of hydrogen peroxide diluted with water after every meal and be careful when you brush your teeth! The sutures should degrade after 2 weeks.
3) That's all I have for now.