on the e60's..removing the grills involved partially loosening the front bumper to get behind the grills and pops the tabs...
here's a good DIY for the e60:
http://raceprecision.com/forums/view...65398bdff52cf3
maybe it's similar to this for the f10, might be worth a few minutes to check out...good luck
RE: painted euro reflectors, just pop them out and have a local body shop paint them, most likely cheaper and faster than buying a new set....