How to use vfx to look like I fell off a building

It's all in the title, really. I want a shot of me flipping backwards over a railing and off a building. The problem is, the short-film I'm making is fairly low-budget and I don't think it's enough to cover hospital bills. I have access to the building in question, and the railing that I want to flip over, the problem is, how? Do I green screen myself in, do I find some way of making a dummy, or do I just do it entirely with vfx? Please help. Thanks in advance.