She has a piano and wants it taken and cleaned.
Do I have her call piano movers?
The thing will probably curl.
Low moisture and dry thoroughly. Curling really isn't common in pianos though.
Actually, a grand piano is easy to get a rug out from under by yourself. I'll tell you how if you really want to do this.
Just remember, whatever you do on-location, whether to save a little effort on your part or to save a little money for the customer, will come back to bite you hard if anything goes wrong. You'll be on the hook for everything involved in fixing it, including moving the piano.
PS: Is there any possibility of referring this to someone else? Do the easy work, give away the goofy stuff.