I agree with 4speeds, you are just going to have to jump in and give it a shot. Shaping metal is something that takes practice. On 90 degree bends I use some modified vice grips to bend the metal. They keep the panel from arching when you make the bend. The metal is going to want to kink around the wheelwell so your either going to have to notch it or work the kinks out with a hammer and dolly. Easiest and fastest way is to notch, and weld the seams when your done.
I always try to find a donor panel before going through all that trouble. Find a late model car that closly resembles the curve you need and start from there. It will turn out much better in the end.