Mostly no, but certain bosses yes. They are all very doable but you may need to change tactics. Brotherhood is hard because of multiple targets. I switched to a weapon with a wider sweep to increase my chance of hitting multiple enemies. I found that mostly I would use the summon assist to distract the big guy (hopefully) and really focus on killing off each little one as fast as possible to keep 2 or less enemies on the field. Use fable arts on the big dude, want to get your major damage on him. If you arent great at parrying look for weapons that give a high defense, or big guy's hits will really chew your health. Swap amulet to the one that hits humans harder. Use your fire thing on the blade sharpener. Use the miracle that heals your partner.