None that I know of... as it pretty much self explanatory.
until that first spotted is broke, it may seem that it isn't going to come out.
stick the end of the muffler on a piece of wood for support straight up and down.
And rack that rebar hard with a 2 pound hammer.
look down the hole and try to have the rebar closr to a side...preferably where the spot Weld is...
Bruce