A wrist-note script, a sound-check, and a slow-walk lap that made my first 30 seconds clean again.
Tape a micro-script to your controller wrist rest

I used to write boss notes like I was leaving instructions for a substitute teacher. It never helped, because I didn't have time to read them between deaths, and I definitely wasn't remembering them once the fog gate animation ended. The thing that stuck for me was a single five-second script, written in fat Sharpie on a strip of painter's tape, then stuck where I'd see it without looking away: the wrist rest of my controller (or the bottom bezel of my monitor if you're on mouse and keyboard). Not the desk. Not a notebook. The spot your hands hover over when you exhale and queue the next pull.
Keep it brutally small. Mine is usually three chunks separated by slashes: "Hold / See / Spend". That translates to: don't sprint in, wait for the first tell, then spend stamina on one planned action. Yours might be "Left pillar / no heal / punish jump" or "Buff / backstep / punish 2". The trick is that it's a script, not a diagnosis. If you're still writing what killed you, you're already in the previous attempt. Scripts live in the next one.
Because this is Game Tips, treat it like UI placement. You're reducing eye travel and decision time. I even color-code it sometimes: black for positioning, red for the one thing I'm not allowed to do ("no panic roll"), and blue for the one spend ("only heal after roar"). And yes, you'll feel silly taping notes to a controller. You'll feel less silly when you stop throwing away the first 20 seconds to the same autopilot mistake.
Do a one-minute audio calibration before you pull

When I get stuck on a boss, I stop touching my build for a minute and touch my sound. Half the time I'm dying because I'm late, not because my numbers are bad. Boss fights telegraph with audio cues all the time: a little inhale before a grab, the metal-on-stone scrape before a charge, the pitch shift that means the follow-up is coming. If your mix buries that under music and ambience, you're playing with a blindfold on and calling it "challenge."
Here's my quick calibration routine. I plug in my headset (I bounce between a HyperX Cloud II on PC and a Sony WH-1000XM5 in wired mode when I'm being picky), then I stand in the arena without engaging. I rotate the camera and listen. Footsteps. Cloth rustle. Weapon idle sound. Then I intentionally trigger one safe tell at range, like the opener swing or a roar, and I adjust only two sliders: sound effects up, music down. If the game has a dedicated "enemy volume" or "combat" slider, even better. If you're on PS5, I also check whether 3D Audio is helping or smearing direction. Some games nail it, some turn a clean left-right cue into a weird bubble.
Then I set one practical rule: the first time I hear the wind-up, I don't move. I just confirm, "Yep, that's the sound." Next attempt, I respond. That one beat saved me in fights where the visual tell blends into the background (dark arenas, particle spam, capes, you know the ones). This isn't about immersion. It's a tip that makes your reactions earlier without asking you to "focus harder."
Walk the arena once with your weapon away

When a boss fight feels chaotic, I almost always discover the same quiet culprit: I'm getting clipped by the room. A little lip on the floor that eats a roll. A broken pillar that blocks the camera. A slope that changes spacing so my "safe" punish whiffs. It's hard to notice when you're sprinting back from a death and your brain is already chewing on the last mistake. So I steal a minute and do something that looks like procrastination: I walk.
Weapon away, no lock-on, no sprint. Just a slow lap of the arena like I'm touring an apartment I'm about to rent. I look for three things and I name them out loud (yes, like a weirdo): the snag (where rolls catch), the blind (where the camera hates you), and the reset (a spot that naturally widens distance). In one fight, my reset was a cracked tile line that ran straight to a back wall. In another, it was the outside edge of a circular arena where I could keep the boss's shoulders in frame. You don't need a landmark you "mark" on the HUD. You just need a place your feet recognize under stress.
Then I do one rehearsal without fighting: start at the fog gate, walk to my reset, face the boss spawn, and do my first two inputs with zero urgency. Roll once. Turn the camera. Heal (even if I'm full) to see where the animation leaves me. It's Game Tips stuff: you're building a repeatable opener and a known escape route, not hoping your hands improvise correctly. The surprising part is how often the arena gives you a free advantage you're ignoring, like a corner that forces a predictable approach or a waist-high object that breaks a charge. Once you see it, it stops being "that unfair fight" and becomes a room you can use.