I was under the impression Prussia was going to be hard, but felt like being reckless and simply went to war with Saxony and Poland immediately. I did make peace with Poland again, but by 1712 I had almost all of my victory conditions and all the German states had declared war more or less one after the other; it got a little hairy when Austria joined in and I couldn't afford any building upgrades until 1710, but I was destroying a stack or two of opposing armies a turn for a while there. Other than the constant razing of my schools it wasn't all that bad.

Presumably as a consequence of the expansion modifier to public opinion, knocking over each province made one of its neighbors declare war, so by the end of it I had two full armies of rank 3+ line infantry and 8 star generals carving their way to the Rhine. Hannover put up a really good fight -- better than Austria!