Lead is dangerous in one way: when it gets into your body. Lead on your skin is not harmful. There are two main ways lead gets into your body: you can eat it, or you can breathe it in.
Not eating lead is straightforward: wash your hands before you eat, and, uh, just _don't eat lead_. Unfortunately this is harder in practice than it sounds: lead paint was a major health problem because teaching young children about lead isn't easy. There are also several lead compounds that actually taste pretty good, so you want to eat more; go ask the ancient Romans about that. Then don't eat any of those compounds!
Leaded gasoline is an entirely different problem, because "just don't breathe" is, ah, not practical. It's exposure that cannot be avoided, and that is serious indeed.
Not eating lead is straightforward: wash your hands before you eat, and, uh, just _don't eat lead_. Unfortunately this is harder in practice than it sounds: lead paint was a major health problem because teaching young children about lead isn't easy. There are also several lead compounds that actually taste pretty good, so you want to eat more; go ask the ancient Romans about that. Then don't eat any of those compounds!
Leaded gasoline is an entirely different problem, because "just don't breathe" is, ah, not practical. It's exposure that cannot be avoided, and that is serious indeed.