Clamp the rebar tightly in a vise. The vise's jaws should be positioned just below the point where you want to bend the rebar.
Put on a pair of leather work gloves to protect your hands.
Heat the rebar at the bending point with a blow torch for 30-60 seconds. Heating the metal slightly will make it bend more easily.
Slip a steel pipe onto the rebar. The pipe's diameter should be slightly larger than that of the rebar, and it should be several inches longer than the portion of the rebar extending from the vise.
Pull the rebar toward you with steady pressure to begin bending it.
After you've bent the rebar a few inches, stop and check the angle with a protractor.
Heat the rebar again and continue bending it until it reaches the desired angle.
If you require multiple bends, open the jaws of the vise and adjust the position of the rebar. Repeat this process until all required bends are complete.