hmm well as far as the outlining of the grills, like i said, i used a buddy of mine - traced it on the gutter gaurd (with a pencil or sharpie) and cut it out the best i could (this part is tough) after i cut out the outline, i then tried to fit it best as i could INSIDE the stock grill lip preventing ANY rubbing on the bumpers (the thicker outer line on the STOCK grill) this was pretty time consuming.... from there it is pretty much touch up trimming. the hardest one to cut was the top grill, the bottom center and outer bottom grill overlays were simple. the top took me the longest but, i also took my time on them.
as far as painting them, i suggest having them powder coated, esp if you do a good amount of highway driving. anything else WILL chip!!! i took my overlays to a local guy who did them for like $7.....
hope this helped, if not let me know and ill do my best to further explain anything for you guys and....good luck, im glad to see i am rubbin off on a few of you to DIY projects!!