I started a campaign here, and so far is't been fairly easy. You can get an alliance with England and possibly Wales and Ireland quite quickly, and then move on Norway. Norway is fairly easy (almost all infantry, which you have equal or better equivilents), but with one hitch: They're spread EVERYWHERE. So you need a good navy, and you need to keep pumping out ships, because Norway will destroy them quickly and easily.

I'm only a few turns into the war with Norway, so can't help much past there.