The replacement Grilles aren't supposed to be tough. I have the eleanor style on my car and I had the body shop do it for fear of screwing anything up. It only took them 10 minutes.
It's not hard to do the grill. There are only tabs holding the grill in. Once you get the radiator cover off, its just a matter of bending the tabs so you can release the grill.
Yup, I like the Cervini's a little better. One comment on their site said that it was easier to replace with the bumper off. I thought that was a bit much.