Actually you don't even need to remove the bolts on the bottom of the. I do everything you posted except when I take out my front turn signals I get the 4 bolts that hold the bumper support on. Then I drop the entire bumper with it still connected to the black plastic lining under the front bumper.

This way I can get to the 6x 10 mm bolts under the headlight that hold the headlight to the frame.