You kinda need to clamp it down on one end. You can do it with your hands from there. Keep in mind that you're not bending it a whole heckuva lot - a little is enough to put it in the spot you're wanting.
If you really don't have any access to a clamp, you could try putting both ends on a hard, flat, stable surface (i.e. a smooth piece of concrete street) so the bend in the bar is in the air. Then push down on the bend with your hand, foot, or whatever.
~K
If you really don't have any access to a clamp, you could try putting both ends on a hard, flat, stable surface (i.e. a smooth piece of concrete street) so the bend in the bar is in the air. Then push down on the bend with your hand, foot, or whatever.
~K