You will already have a free Clauses bellli on Denmark for 'liberation'.( ONLY FOR AHD OR BELOW). After that, you'll have to fight Denmark over Holstein. After the UK gets the 'Victoria's coronation' event, Hannover will no longer be in the UKs Sphere, so you can sphere them easily from there. Hannover starts on the Sphere of the UK, but since the brits are focused more on other sphering issues, it can be fairly easy to knock off Hannover from the sphere of influence of the UK. Now, the 1st step you could do is to try to sphere Hannover. To the east is the Russia Empire, to the west of you there is Belgium, the Netherlands and France, and to the north of you is Denmark with Holstein, her puppet, and Sweden. To the south of you is Austria and her allies/spheres, Bavaria, Wittenberg and Baden. You'll start out with the usual aspects of Prussia.