I had a wisdom tooth removed when I was younger. They anaesthetized me, so I don't remember the actual surgery. Since you're removing three at a time, there will be a lot of swelling as you've probably been told. I would suggest you get some Soylent if possible, though that can get boring really quick. As others have said, scrambled eggs, yoghurt, soup, mashed potatoes, etc. I suppose you could also have regular meals and shove them in blender and eat that way.

I wouldn't sweat it with the surgery itself, it's such an old, well practised surgery there is very little that can go wrong.