Ask the Surgeon. The person peforming the procedure is always a good person to ask and have everything explained to you. Laughing gas btw is not a substiture for anesthesia. At minimum you will still get local anesthesia. I, myslef when having the procedure had both local anesthesia and "laughing gas" and procedure was smooth with no pain.
Versed. I had mine out 25 years ago with concious sedation. Smooth induction, no nresidual effect, and peri-procedural retrograde amnesia.