It is completely normal to be nervous at this point.. but lets get some facts straight.. First you have to understand the underlying reason for the extraction. Every surgery has inherent risks involved.. so make sure you understand why they need to come out.
Second, the IV sedation is not what makes you not feel the proceedure, it is the same local anesthetic that, when done correctly will assure you will not feel any pain. I am sure they can handle that. Where IV sedation comes into the picture is exactly for patients like yourself that is very apprehensive. You can basically sleep or be in twilight while they do their work. This is good because the worst part of the proceedure is you seeing all the tools and hearig all the noise, and the memory of it later.. IV sedation will make sure you won't have that awareness and later the memory so its all good.
I highly recommend it for these procedure. Good luck.