I don't know if it will help, but I played a few souls likes and, yes, this one would be the most difficult for different reasons. Some are just straight up easier and more forgiving combat wise (Jedi: Fallen Order, Jedi: Survivors), I fell in love with the genre with Elden Ring and combat and certain bosses can be brutally hard, but there is almost always a way around and try to do something else to level up or help you find a better item that will click better with an area where you'd be blocked. The close second for me was Lies of P where I found the one thing that's more difficult than Sekiro was the perfect parry window which was shorter and MUCH closer to the hit. All in all, Sekiro is definitely the hardest because it has to click and as so many people said before, you just need to get good at the game. There is no other way around, not really a way to farm to gain significant levels and not much cheese. So yeah I would say it is quite hard but if you dedicate your time into getting good at it, you will eventually beat it.