y'all have experience with a shop that can install these? or are they simple enough that I can do them myself?

i looked around a bit and couldn't seem to find any instructions, but I do know there's drilling required into the rear bumper.

maybe Vertex? or just a Nissan dealership?

 

They shouldn't be hard at all to install. I installed my front/rear splash guards before I had my kit and it was cake. These shouldn't be any different. Just align the part that connects behind the rear wheels and attach. Then you should be able to use your own judgment and mark where you need to drill into the rear bumper.