Hi, I did mine, it was quite easy actually.
I started with a smaller hole saw as the panel is curved and you have to cut at an angle to be in-line with the chassis if you get my meaning. I then slowly opened up the hole with a round file so as to be sure to be in the correct place.
Take it slow with small steps, make sure you cover the area with masking tape to prevent scratches if you slip and you can't go wrong.
Good luck :-)
