Thanks everyone for the words of advice - I took it and called back today to cancel my very specific building request.
We've never requested a location before and have had some GREAT ones so I'm going to tempt fate once again and see what we score.
I guess the difference is, I know more about the locations now - my follow up question would be - when you check in, they type away and then say, "here is your building . . ." - I don't want to be a pill but at what point should I jump in here and politely ask if they have other availability? Just seems like it's already a done deal by the time you find out where you've initially been assigned and I know the CMs at the desk deal with enough pests - just want to make a request for a different location (if I have to) as smooth and courteous as possible. Should I just ask immediately as I check in if they would mind showing me the villa location prior to finalizing so that I might have the opportunity to make any requests before they have essentially finished up?
I see that I am rather verbose today but so much appreciate everyone's input.
Everyone have a Disney day!!