Morgra and Kiki have got you covered for much of it, but be sure to ask about the kind of pain meds you can take (and know whether you're going under anesthesia or simply using numbing shots). When I went in to have mine removed, I went under anesthesia, and I had a reaction due to another pain medication, which they suspected I was allergic to. When I went home, they sent me with another kind of medication for nerves and to chill you out, but it made me nauseous. For those reasons, I stopped taking my pain medications, although even without the medication, the pain wasn't too bad, only a little sore; if you've ever had braces, it didn't hurt more than an adjustment to your wires. My sister had the same meds as I did when she had hers removed, though, and hers went splendidly. Everyone will respond differently to the medication-- just be sure to talk over any allergies to meds that you might have with your doctor/anesthesiologist. They often have substitutes for different pain meds, so they should have you covered. c:
Try to sleep on your back, if possible. If you sleep on your side, with your face against the pillow, the side will become sore. Use lots and lots of ice. Be sure to get lots of rest to speed along the healing process, and don't overwork yourself.
Your mouth will feel very solid and difficult to open, if you have many being pulled (I had my four taken out at the same time). It's normal, so don't feel concerned that there is something wrong with your jaw. The gums get a bit swollen, so it restricts the space you can maneuver your jaw. Of course, you will probably be able to contact the doctor should you think something seriously has gone awry, but don't be shocked by it. <3
Drooling will happen, too; Be careful not to dislodge anything, but have some clothes, napkins, and tissues on hand. I got a little sore throat after having mine taken out, due to the dryness of my throat, so be sure to have blankets and keep it cozy in your room. c:
Also: Those videos that you see with the kiddos acting wonky after the pain meds may or may not happen. It didn't happen to me, and I was conscious on the car ride home, but have a talk with any parents/friends that are going with you (you won't be able to drive home) about recording on their phones, if you're not comfortable with that. Looking back, the experience wasn't as bad as quite a few people had suggested; don't be too hard on yourself, and take the downtime to do something you enjoy-- watching a movie, drawing, playing a game, etc. Good luck, and you can get through it!