It is a pain. The first one I did had a wiring harness squeezed between the top of the bracket and the underside of... something. I think the dash support. I think I added the bracket that supports the clutch to the left side of the existing bracket, and bolted it in. I don't recall the second one being such a pill. That time, I think I ended up pulling the entire bracket out.
One thing that you will notice is that the manual "pivot bolt" is much longer. The original was installed from the right. The replacement will likely have to be installed from the left, due to the tunnel being in the way.
It's been a long time since I did this. I don't remember all the details, but it seems like the more stuff you can loosen (banjos... master cylinders, etc.) the easier it will become.
No useful shortcuts. Just have at it. You will spend a bunch of time laying on your back, looking up at the underside of the dash, and cursing GM engineering.