Replacing the dome

I just got the replacement dome lid for the front ceiling vent. It's a little too late in the day to attack this project, and actually it's a little hot! (Eat your heart out, Boulderites!) But tomorrow we see how this goes.  I plan to be extra careful not to scratch it so if it doesn't fit I can send it back.

Isn't it purdy?

The challenge is to see how few trips up and down the ladder I need to make.

What did we do before Amazon.com?