Kebab and Baguette are really, really, really easy. Schnitzel and Kipper are also pretty easy, but they have to deal with Baguette's crap a lot (though if you lose the 100 Years War as Kipper as soon as possible you'll be fine). Larger HRE minors are fun if you think you know what you're doing, just be wary of the Kaiser. If you have AoW, Norway or Sweden might be okay but Denmark or Poland would be doable either way.
Basically, you can either play a more peaceful game in Europe, colonize, and then use your money to conquer, or be at total war pretty much always. Borders with France suck but are okay if you're big like Castile.