Good luck with them. I was talking to a guy up in Ohio on corvetteforum who had gotten the same setup I did right around the same time. He and a friend of his did the install and said it took them around 12 hours all total for the job. He told he that knowing what he knows now, he would have paid someone else to do it. But he's around my age (55), so perhaps you have less miles under your belt and this wouldn't be the chore it is to us older guys.
Are you getting them directly from LGM? The cats I got were not the Random Tech ones, but something similar looking. Didn't have that polished stainless look to them and looked like just plain old stainless steel. No big deal since no one is going to see them anyway.
Oh, btw, from what I have heard, you are going to really need to bang those cats and pipes ALL the way on to keep from getting some minor exhaust leaks. Bear that in mind so you don't have to go back under your car to fix it later.