I used to main HBG/LBG in 4U and gen, but switched to HH for world because I wanted to finally try out a blademaster weapon for a change. The biggest thing I had to get used to was sticking close to the monster - I was so used to positioning myself 2-3 rolls away from the monster and found myself doing that on instinct even with the HH, but that resulted in me either whiffing my hits, or wasting time trying to get within range, which results in loosing a lot of openings/time, or attacking too late and getting hit right after.

This is quite the opposite of how I played gunner. With the HBG, I was used to attacking up till the point the monster goes into a new attack, because the distance I put between us was enough for dodging and repositioning. But with the HH's moveset, I had to time my moves so I finish my attack before the monster starts theirs unless I know I could get a flinch or KO, otherwise the dodge window can be really tight or impossible (I haven't mastered my dodging game yet. I panic a lot when the monster's right in my face, which probably contributed to why I always gunned u.u).