I don't currently own an iPad at all, but would like to pre-order one through Apple.com. I have definitely decided that I want a cellular one. Here's my question though: when I pre-order on the website, if I choose AT&T, will it take me through the prompts to set up a cellular plan for a tablet, data only? Or will Apple just send me a cellular iPad and require me to take it into an AT&T store and get everything setup? I just want to know how much of a headache this is going to be. Thanks.