You'll be working with very hot, very powerful and potentially dangerous equipment. Machinery can grab hold of you or things attached to you. Remove jewelry, tie back long hair, tuck in shirts, and button up cuffs. Remove all possible flammables from your work area. Weld on a metal worktable on a concrete floor, and have a fire extinguisher nearby.
Sparks can fly in the welding area.
For light welding, flame-proof cotton clothing is sufficient. When working with electrical devices, make sure you have dry clothing. And do not stand on a wet surface when welding. You ll be grinding metal, so safety glasses and earplugs will be needed. Do not allow other people in the work area, unless they, too, are adequately protected.