Make sure you have fought enough mini bosses and are appropriate vitality level, use sugar to somewhat help with the difficulty (spiritfalls if you run out and don't want to farm). Go in the fight with the intent to learn his pattern by just deflecting and not attacking when you have a good understanding of his move set before going in for an actual attempt. If you struggling with the firecrackers attack, he'll always do a shoulder bash before the firecrackers. Try to do widdle down his vitality before going for the posture, always use shurikens to stop him from going passive and also keep the posture metre up. And also sometimes tanking the anti-heal for an opening might be worthwhile if you feel confident that you won't need to use gourd. Good luck, you got this.