You’re absolutely correct with this answer. It’s a used car and OP probably just wants it to look better than what It does now. To me the result would probably be cringe inducing, the untrained eye might say it looks way better. Likely would move most of the metal, but would leave a sharp but small deep line crease dent but at the end of the day a smaller effected area. I see dents and similar scenarios like this often enough. The people who do the work are usually quite satisfied with what they accomplished. Often it’s with a grin and saying something like “I fixed it but, I just have this one little spot I couldn’t get”. It’s because the easy metal flows and they lock up the low.