Sounds really obvious but i think first goal is crucial, if they get it, on the back of tonights win then it will make for a tough afternoon for us, the confidence will be up, the fans will be thinking there season has finally started and get behind them.
However if we score first i think the exact opposite happens, they will turn on them, they expect to take points off us (like i expect us to take points off them) they have proved the last two games that a young team blows hot and cold, Saints they got destroyed and yet tonight go up and batter Man City, and it dont matter what team Man City put out it will have a lot of good players so fair play to Villa there.
Our team and squad i think is better than theirs on ability alone but take into account other factors, derby game, home advantage, good win tonight, etc, etc i would take a point for sure on sunday.