User blog comment:Mathmagician/Wall of Flesh Solo Guide/@comment-76.10.146.132-20111219022027/@comment-4674838-20111219023141

I did this on a small world, but the world size doesn't matter. My hellevator happened to be directly at the world spawn point, so I built my bridge from the center towards the right (without ever getting to the far right side of hell).

The key is that you spawn the Wall of Flesh at the end of your bridge that is furthest away from the world spawn point. In my case, that happened to be the right side--so I moved left during the battle. If I had spawned the Wall of Flesh at the other end, then I wouldn't have been able to utilize my bridge. I made sure to emphasize this in bold font in the walkthrough, as it's very important.