Hi Andrea,
My personal suggestion would be to go ahead and follow the battery replacement guide up to the point where you unplug the battery on Step 25. It won't ensure the phone is off when removing the old screen, but it will guarantee that it's off when you attach the new display.
Google Pixel 6a Battery Replacement - iFixit Repair Guide
Of course, you'll need to move the fingerprint sensor to the new screen unless the replacement came with it already installed. If you're reusing the original sensor you may be able to get away without recalibrating it, but it's probably a good idea either way.
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