[snorgle] Good luck! Expect some discomfort, but console yourself with the fact that it's not real pain, and you'll never have pain in that tooth, nor the pain of an emerging impacted wisdom tooth, again. Besides, it gives you the excuse to drink medicinal strong spirits over the weekend until it feels better. :o)
Yes, unlike CdM, I found it did sting rather. Pace pen, be careful not to drink alcohol if they put you on strong antibiotics afterward! Oh, and if it does hurt, a cloth damped with hot water held to the face is a lifesaver, better (although more short-lived) than Ibuprofen.