I ordered mine on a Monday as well, it showed up on the following wednesday.
The cover will be folded up in a box, so you will need to let it flatten out a bit before cutting.
I just opened the tub and layed it in covered it back up for about 2 hours.
After that I used a pair of scissors to cut it in, I left it a little over so I can trim it up better when its
not so windy and cold.
Hard to say how much its doing , It seems like there is less steam coming out of the tub but I dont have any
numbers to really say how much better.
Just seeing how when the cover is open there is no steam rising out....none at all when I was cutting it...it has to be working