Yer in for a wrestling match. Unfortunately the more fancier) equipment you have the better for doing this, but......YOU CAN DO IT! yay.
The first thing I fond mandatory, is to get the stave as thin as possible before you correct it. Prevents accidents and improves results. You already have a flat belly surface, so either mark a thickness you want to remove on both sides, or use faceted removal techniques. If you can get to an even, say 3/4 or even 5/8" it'll work better. If it's thin enough, you can do the whole thing with dry heat.
For straight, even twist, I often lash some cross pieces on each end and then use it to crank the twist out as I dry heat, clamping to a form as I go. I mean, clamp one end, use the cross pieces to pull twist out, clamp a foot down the line and heat that section.
If you have a big steaming set up, you can wrestle the bow onto a form with wrenches and clamps and steam the whole thing.
It's hard as heck to get recurves aligned as you go. This makes steaming best, then cranking in recurves with dry heat work best for me. Either way, I do it last.
