Having repaired and strung a fair amount of both barbed wire and electric fences when I was younger, let me give you a tip: To check a wire to see if it's live, don't grab the wire. If it is live, your muscles will contract causing you to grip it harder. Instead, lay the back of your hand on it. If it's live, it'll just cause you to jerk your hand away. Either that or talk your buddy into grabbing it.