Reddit reviews Hakko T18-S7 - T18 Series Soldering Tip for Hakko FX-888/FX-8801 - Bevel - 1.2 mm/60? x 14.5 mm
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Shape: BevelDimensions: 1.2 mm/60 x 14.5 mm
Yeah, that would be alright. An unregulated iron would get way too hot, so having any kind of regulation makes all the difference. With one of those irons, I would use an official Hakko T18-S7 tip, this solder, a flux pen, and some 99% isopropyl on q-tips to clean up the flux afterwords.
The temperature you want is as low as possible but still hot enough to melt the solder pads as soon as the iron contacts. Somewhere around 330C. When you're doing a hard mod, you don't want to make contact with the iron for more than a few seconds at a time or you could start melting off SMD components around the pads. Allow the board time to cool between wires.
To contradict OP, almost anyone can do a hard mod with the right equipment and technique. It's basically cheating with the above setup. People who botched theirs had to be doing things very wrong.