As other have said - to get it back into shape will take a lot more planning than it did to bend it out!
Heat will destroy the paint and will ruin the temper of the steel if done incorrectly. Placing stopping points on either side of the bend is the best idea, keeping the correct form intact while you work to correct the bend by itself is the part that will take the most time. Like TJ said - the metal is stretched at the apex of the bend, and it will not come flat again. No matter what you do, it will never be as flat as it was from the factory, Like many of us who have placed a dent in the hood, bucket etc, the being "pissed off" factor grows into a "learning curve" and we all accept the fact that we have screwed up! And a little of the screw up will be left behind. BTDT ! (nice dime size dent in hood with 2 hours on the machine)
Find you a clamping tool that will be strong enough to place the pressure there, and then block either side so the pressure will concentrate only on the bend, moving the blocks in and out will allow the pressure to change.
If you go with the BF hammer, beat on something other than the bucket.!
Take pictures of what you end up with!
