In this speed run the first thing you need to do first select your research which is going to be market structure to gain influence in countries faster and immediately start boosting influence in Denmark and Holstein while also increasing relations with them to increase influence with them at an increased rate

also start doing foreign investments in Hannover while increasing relations periodically there as well

you also need to mobilize and start justifying to conquer Saxony just take it over and destroy Austria's armies then peace out with Saxony now annexed

then all you have to do is make sure Denmark and Holstein are sphered then move on to Hannover, there is a lot of RNG involved with the coronation of queen Victoria but you just need to boost your influence and hope she's coronated before you have to remove Hannover from England's sphere manually so this might take you a few runs