Advice for new player

For context I love bloodborne as it was my first soulsborne game back in 2017 and I still play to this day. I got the platinum trophies for bloodborne, demon souls and all 3 dark souls games but never got the parry system down in ds compared to how easy it was for me in bloodborne.

I’ve gotten to the butterfly boss and the one on a horse before I dropped the game as I found they were impossible to beat and some of the regular enemies are tough as well. I haven’t beaten any bosses and the stagger meter is tough to build up when dodging or blocking enemy attacks as the meter drops considerably for enemies.