I'd run a razor knife about along side of the corner bead. You'll be cutting through the drywall mud that would be close to it's thickest area, so probably a bit of knife pressure would be needed. But the cut would be pretty straight, using that metal as an edge guide. Then you can chisel out the drywall mud on the bead strip without it encroaching on the drywall part. Once you have that exposed you can easily see where the nails/screws are and remove them.
If your going to reinstall corner bead (existing one is damaged) then you don't need to be too careful, just grab hold of behind it with the claw of a hammer and pull. the nails will pop straight out and any drywall damaged is very easily repaired with new mud when you install the new bead.
DON'T grab and pull with bare hands.
Little about a lot and a lot about a little.
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