Lead is fairly easy to weld too. Usually it's done with oxy-acetylene, but (TODO: research this and confirm) it may be able to be welded with oxy-propane.
Inhalation of fumes, such as from leadwork welding.
Ingesting materials containing lead, such as lead paint, or lead dust left over after drilling or cutting solid lead. This includes swallowing contaminated materials, as well as inhaling fine particles.
Fabricators who work with lead usually take these precautions: [1][2]
When welding or soldering, maximize ventilation, and wear (TODO) to avoid the fumes.
If you do any operation that could create dust — sawing, sanding, drilling, etc. — be extremely careful to not spread the dust around, and make sure it's vacuumed/mopped up immediately.
Better safe than sorry: (The evidence behind these is unclear, but these practices are widespread among fabricators.)
Fabricators should always wear gloves. End-users should avoid touching solid lead.
Decontamination — Fabricators should wash their hands after using it, to avoid carrying trace amounts away.
Decontamination — It's worth changing your clothes afterwards, if there's chance of carrying lead dust.
Decontamination — If fabricating a small part, put down plastic sheeting first. Afterwards, carefully wrap it up and throw it away.