The pedals are fairly straightforward if you know what you're doing. I'm confused why you want them on an automatic, but that's your business.
The Honda underbody kit install is very simple. However, it involves removing both the front and rear bumpers. It was one of the first things I ever did to a car and I had success. Saved me $300 in labor, too. Plus it was a load of fun :thumbup:
Oh, and welcome to HAN