Tutorial to upgrade your ROM to WM6

I've read through a lot of these threads, but my one question before I try to update my ROM is do you have to do anything to the phone (ie, re-activate it) once the ROM update is done? In other words, after the update, will it work as is once it boots (be able to take calls, connect for data usage), or do you have to do something so it knows it's your phone number? Yes, I IZ N00B to this, but I also can't not have my phone out of commission. :P