Ordering paint.
Chad,
I would be generous with the amount of paint you buy. I have never had paint actually cover the square footage they say it will, ever. Now, keep in mind I am not a professional painter, you knew that, and that paint systems vary from one manufacturer to anther, you knew that too. But about the last thing you want to happen is to run out of paint when you are almost finished. That sucks!! Order an extra quart or something. Advice worth exactly what you paid, your milage may vary, etc...
Ben