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Lead and Cadmium are cumulative poisons, meaning they build up in your system and kill you nice and slow. Read the Manufacturer Safety Data Sheets (MSDS), and check out the Toxicity Profiles for Lead and Cadmium.
Both are fairly safe to the touch - the real danger comes from contaiminating your food (or cigarettes) with unwashed hands, or breathing fumes or airborne dust. Good ventilation or a respirator, and lots of soap and water, will protect you. Clean up after yourself so any dust doesn't get spread around. If you have kids (who absorb heavy metals better, and are more suseptible to their effects), do something else instead