We go in with a cut off wheel and grind the weld away. it is a long process, but make fo a nice job. You will still have to open it a bit as Zach said to be able to weld it also. We also use a cut off wheel to grind away a lot of the other welds, particulatly in the trunk jam so as not to drill through, also the front edge in the jam and the welds by the striker. This way we do not butcher the original attaching panel