Your army tech is the same is it not? They might have Army Professionalism but I can't remember. You don't have any artillery at the beginning but I don't believe it would matter much since its not that powerful early game. It's worth a try to attempt I'm sure you could do it.
As I played more I found it easier to get around alliances. They always seem to ally with someone weak. I wanted my land from France to form Germany but they were allied with Russia and Austria. France was also allied with sardinia-piedmont. So I declared war on sardinia-piedmont and France joined. That why just a war with France and sardinia-piedmont instead of France, Austria, Russia, and a dozen lesser powers.
Army Professionalism is pretty important, since it's a tactics boost, meaning they lose only 2/3 the soldiers I do in battle, all else being equal...