I’ve had all four removed. But since you’re looking for reassurance, I better not tell you about it. 
I had all 4 out at one shot in 1978.
The oral surgeon looked so much like John Denver that it must have been his long-lost twin brother.
I had mine out about 24 years ago. Some sort of IV sedation - the oral surgeon told me that if I went for local “you won’t feel anything. But you’ll hear the cracking”. That was enough for me to opt for IV. I remember they put me out, and I came to just as they were finishing. Some part of my brain told me “They’re doing something painful. You should yell”. So I did. despite feeling no pain. I heard an authoritative voice saying “that does not hurt”. I believed it, and shut up 
Then they tried to make me hold up an ice pack to my cheek. They’d put the ice pack in my hand, bring it up to my cheek, and let go. My hand would drift right back down to my lap.
Once I was able to walk, they sent me home. My friend had already picked up my painkillers, so she got me home, cooked up some ramen for me, and gave me my drugs. I spent the weekend on the couch, watching TV. Bled a bit on the pillow one night. By Monday I’d long since given up on the painkillers (Percodan, I think) - still some discomfort but nothing major. No dry socket or anything. All in all, an OK experience. (I won’t comment on my root canal experience a few months ago).
The funniest part of it was the location of the oral surgeon. His office was on a short street that had nothing but restaurants, with two exceptions: his office and the Weight Watchers office. Talk about conflicting businesses!!
I am three-quarters evolved. I only ever got one and it came in nice and straight. However, I have a narrow hard palette and the rest of my teeth started to shift so my dentist pulled it…in his office…regular novicaine. It came right out. There was no pain. The sound was weird but it was very fast. I had no significant pain or swelling that I remember.
This reminds me of one important piece of advice, if the extraction hasn’t happened yet: Put a towel down under your head whenever you’re planning on lying down/sleeping. There are small but permanent stains on my mattress pad and one of my pillows because I forgot to do so.
Definitely get the gas, or even the full monty knock-out if you’re really squeamish. The sound of my tooth being cracked, the device that props the mouth open, and even though you don’t feel what’s going on the “sensation” of hands in your mouth was something I couldn’t have done sober. No way to sugarcoat it- it’s not a pleasant experience, but it passes fairly soon.