Question about dry socket?

I'm getting all 4 of my wisdom teeth removed Wednesday morning and i'm worried more about potentially getting dry socket rather than the actual surgery itself. I know i'll get a care sheet of some sort but I want answers from others who have actually had oral surgery..

Help ease my mind and let me know how likely this is to happen, please!

I've heard that if you dont have a dry socket after the first 3 days or so chances are you'll be fine, but i'm not sure if that was true...

Kindof freaking out here...

(No rude answers please, I know I could have looked it up somewhere but i'm pretty fond of Yahoo Answers and felt better asking myself..)