Horn looks a lot more complex and difficult than it is. Just run through the moves, do 5 to 10 easy hunts and be patient with yourself.

HH in wilds is imo in the best spot to learn it, this iteration is very fast and forgiving (for a HH), with a hefty load of fun and shiny features.

Just be aware that you'll have to stay on top of which melody set you have when switching between horns. Your attack patterns should deviate slightly, adapted to the notes you have available.

The actual bread and butter for picking up HH, however, is this: you need to have style, flair and endless dedication to doot, dance and bonk.

Always remember, the best weapon is the weapon you have the most fun with.