Did you take a gravity reading before pitching the yeast and was the reading yesterday any lower? That will tell you if fermentation has began. If you are starting to get some bubbling out of the airlock, it sounds like it's doing it's thing, so RDWHAHB and take another reading in a week.
Also, if it's that full, you'll probably want to put a blowoff tube on it before you end up with a mess.
Originally Posted by Randar
I want to see FatBrad's d***.