Toxicity of metallic lead (Pb)
Metallic lead is very low risk.

Lead compounds are fairly poisonous: they slowly build up in the body and cause many harmful effects. But lead metal is very inert and you would need to do something fairly risky with it to create much likleihood of generating dangerous lead compounds.

Don't eat it, for example. Don't put it in contact with food (especially acidic foods which can solubilise lead). But normal handling should not be a problem. 

Lead is so inert that it has been used to pipe clean water supplies to people for most of history (or at least the parts of history where somebody had access to clean water). This is safe unless the water supply is particularly acidic and leaches lead from the pipes. 

In short: don't worry about lumps of lead.