With the windshield removed, it was time to mark 1" inside the recess for cutting. The extra fine point sharpe works great for this. I used a die grinder with a cutoff wheel to do the cutting. I left a small piece uncut at the top and bottom and then taped the cutout in place so it wouldn't fall when I finished cutting it. I just tried to get it close because I thought it would be easier to trim with the piece removed.