Grille trim shouldn't be a problem. I can reach behind the bars still.
I used some rattle can bed liner in the underside of the fenders. It should help with rock chips I'm hoping.
I used some weatherstrip adhesive to glue the fender welting on. I had to do relief cuts to fit the curves and then cut holes for the bolts to go through. It took me a little while to figure out where the bolts go that hold the fender and the liner together and which holes were for actually mounting it to the truck. I like that there were larger clearance holes in the cab and brackets to clear the liner bolts. There won't be any metal-to-metal contact there.
Just the bare fenders look quite large by themselves and no headlights. I suppose they are a fair amount larger than a pickup.
There's always that fear that I won't get something assembled right or forget something. So far I've been able to figure out how it goes together. Kind of like a big puzzle. Sometimes I'm amazed I have all the little pieces needed, that they didn't get lost. I wasn't super diligent on keeping track of how it all came apart. I was able to keep all the parts together at least. I guess it's all part of the learning process.