I kill copperheads but I've caught and relocated dozens of black snakes. If you are fast just grab it by the neck right behind their head. Easier is to use a golf club or stick (or an axe handle!) and gently pin it down behind the head then pick it up with the hand. I keep a 10-gal plastic tub with air holes drilled in sides and top to keep them until I can haul them far away. Note that I have nothing against black snakes since they eat a lot of mice and such but they get in the chicken house and eat the eggs too. Once a black snake chased two peahens off a nest with almost 30 eggs which killed them - that was potentially $3000 worth of peacocks!
I've caught snakes 6' and longer this way. They will wrap around your arm and squeeze like a baby python but they can't hurt you. Even if they were to bite you it probably wouldn't break the skin.
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(I'm the guy the neighbors call when a snake gets in their house or they [gasp!] see one in the yard.
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