Rudimentary tools (and process) for reshaping a small piece of steel?
First off I wouldn't heat it, it's not that thick and heating it may mess it up. Basically your going to have to get creative. You'll need a vise, clamp it in the vise. If you need to flatten an area put it on a flat spot of the vise and hit it with the hammer. If you need to open it up use a vise grip to bend it open. Search on youtube for "hammer and dolly" for techniques on bending. These tools may help.