Don't try to 'unpick' the spot welds, it will distort the edge of the A pillar beyond repair. Carefully prise the fold apart, so you can see the spot welds underneath & get a proper spot weld removing drill bit, like the ones from Frost, or cut the old 1/4 panel as close to the seam as poss, then carefully grind what's left away, it's too easy to damage the un-folded edge this way, so be careful).
I usually 'cheat' after spending an age with a hammer and dolly once. I grind the edge of the fold away so that you see the 2 edges of the panels, drill out the spotwelds, fit the panel and make a 'cap' of folded metal of the same dimensions as the original folded over bit and weld that in place. Once ground down you can't tell it wasn't original and you end up with a perfectly straight seam too.
The fold is very hard to unfold, if you don't have the right tool to do it. if you try to do it with a screw driver you will wind up stretching it every cm or so and it will not fold back very well. The unfolding tools (you need right and a left handed tools) are very expensive, but you might be able to do a good job by fashioning a lopsided wedge at the end of a large crew driver and driving it under the fold (from the bottom) so that it unfolds smoothly. In doing this, you need to make sure that you don't push the whole seam rearward, so a second pair of hands with a supporting dolly would be a good idea. The fold has to open to at least 90 degrees so careful use of a flange tool would work as a last stage opener but, again, don't stretch the metal!
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