There are several things you can count on happening on the jobsite and change is definitely one of them. It's never small, simple changes either, right? It's the hefty ones that make your job a stressful one. If only owners and architects realized that changes like adding a wall, or changing the paint for the entire building from egg shell white to ivory white (really?) add up, costing everyone time and money (a lot of money). Hang in there, and remember that some change is good (like learning to meditate to alleviate your stress from all these change orders).