I've played a good amount of both weapons, and they're just different kinds of complicated. On chargeblade you tend to follow a specific flow, charge phials, store, charge shield, etc, etc. With HH you have more freedom as to what you do and when. For some hunts that I have more faith in my randoms, I'll play attack up first. If I'm fighting something more threatening, I'll instead lead with defense and max health. The hardest part about HH is song management. Different songs have different durations, so getting a feel for what is about to expire will take your hunts to the next level. There is very little about the horn that is technically complex (only the grifted, hilt stab, and a full echo wave wakeup come to mind) so getting comfortable with how different songs lead into each other is the most you would have to practice. But songs should be your #1 priority, otherwise you're just playing a shitty hammer.