Thanks guys, how simple is this to achieve or how exact does it need to be?
As I said I'm new and just trying to get my head around best approach for when I get good enough to tackle my car.
I seen something on youtube that was suggesting to spot weld a lap joint (like I marked in red on top) and then with the grinder cut a 45 degree angle a few inches at a time and then re-weld it in place when the angled cuts meet together so it ends up being flush?
Or is jogging just a lot easier and what I'm suggesting?