I had all four out in hospital under a general. I felt no pain whatsoever!!! The only time I was uncomfortable was when I slept on the same side for a while at night, I would get a weird pressure feeling in my jaw but apart from that I would hardly have known I'd had them out.
The stitches were also kinda annoying and the huge holes take forever to fill themselves in and stop getting food stuck in them. I found it really weird when the stitches came out, it looks like there's a 2 inch hole in your gumline!