The beginning of the game is very tough imo, it gets easier after a while.

When you say "the two killshot guy", do you mean General Naomori Kawarada? It's a good fight to train the combat system of this game. No bullshit, just deflect his attacks and punish his sweep attack by jumping on his head. Don't try to dash around and dodge his attacks, get in there and parry.

Ogre is a bit more annoying, you can use fire against him though. If you don't have the fire prosthetic, it's in Hirata, you missed it. You can avoid his grab by jumping. If he throws you in the ravine, you can grapple to him to save yourself

Juzou can be done a bit later, he's the hardest of the three imo.