Much appreciated DIY!
Ordered a pair of piano black grilles for my F34 GT and using this guide everything went swiftly with a little patience. Took around 30 mins in total.
I found that unless you have really skinny hands and forearms it's super tricky
to remove the stock grilles without tools. So I'd advice sticking with the original method of loosening the bumper to give yourself some elbow-room.
Here's a pic of the final result:
