Been there, done that. Not with copperheads, though.
Have a go.
West African carpet viper (Echis ocellatus). With the small ones, I was more or less ok. The big ones gave me some adrenaline when I spotted them.
Just FTR: the ones I spotted, I almost always spotted when I was far to close for comfort. Whatever you do in the African bush: wear proper garb. High boots. Long, robust trousers. Gaiters, in some circumstances.
