I had my bottom two out earlier this year, and there's plenty of advice I can give you.
First: Follow your doctor's instructions. Listen to them when they say stuff like don't use straws and don't eat popcorn, because they mean it. The less time you have to deal with the pain the happier you'll be.

They'll also give you an ice pack and tell you to use it very often. Do so...you don't always have to be lying down to use it (you can hold it up to your mouth) and, for me anyway, it worked better than pain medication. It also helps reduce any swelling.
Second: Don't try eating solid foods for a week or so after surgery. I had trouble opening my mouth wide enough, and when I could chew something it hurt a lot. Stick with soft foods, like liquids, pudding, and jello, and foods you can easily cut up into pieces you can safely swallow (pasta's a great example).
Third: Don't eat extremely cheesy things like pizza. That stuff will get stuck back there and reek.
Fourth: Be careful about how you clean your teeth. It's actually a bad idea to brush them a day or two after surgery (it could mess up the stiches), so use mouthwash instead. Besides, it makes your whole mouth feel nice and clean and cleans out any new nooks and crannies that may have formed.
Hope that helps, and good luck!

Yes, I'm still alive...still alive...