@iris @Andy @wokstation
Well ventilated and fire proof.
Outdoors, or, say, an open garage space.
Clean of flammable materials, dirt, and mess.
Welding has a habit of throwing sparks everywhere, and you can't see it because you have a face shield on. You also can't see if you are on fire either.
Wear leather, or at lease natural fibres, not stuff that will burn and melt all over you.
Have a fire extinguisher to hand, and a fire watcher if you are welding lots.