Call the Hulk!
Seriously though, you could use a vice, some pliers and a metal pole to get a nice curve.
I ended up bending it over a large pan!
Wow! When I was working on metal armor a while back I tried to just bed it with my hands... I had two subtle lines where the metal was stressed. This looks great!
Ideally, you want to "Roll" the metal over a smooth round/tubular surface. This keeps you from getting creases in the metal.