Colin - I'd take it back to the pros and let them do it.
One other thing in that area that I think everyone should check is the rubber "window sweeps" that wipe moisture on the outside of the side windows, and seal the top of the door from rain intrusion.
I recently have been rehabbing my car after a long time sitting in the garage. I noticed that the original inside window sweeps were still soft and functional, but the outside ones were aged like hard plastic. Just flexing them with two fingers caused them to crack. This is on a car that never sits out in the sun.
This allows water to run down your window, inside your door, and will eventually trash your electrics in the door.
Anybody with a 20 year or older ZR-1 should check this out. And that's all of us.
