yeah you'll need a hammer and dolly, for this. I recommend a heel dolly. A general purpose has too much crown (curve) and a toe dolly gets your fingers too close to red hot metal. Body hammer...not a ball peen or anything else.
As far as where to start, that's where experience plays a big roll. The better you attack this, the better the result can be. I would say (again, this is ballpark) to start on the smaller ones first, that way you can get a feel for it. Don't be afraid of getting the metal hot, red hot in the center of where you're working.
You'll need someone with you, as you have to work fast while doing this. Have a friend ready with a bucket and a wet rag ready to cool the metal after you're done using the hammer and dolly (again, this is hammer ON dolly. OFF dolly with only cause further stretching).
You can work the same area a few times, but the more you heat the metal up like this, the more carbon you're taking out of it, and the more brittle it will become. so make what you do, count.
ps - wear some kind of thick, safe gloves.
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