I already have Dish Network service, and have a couple 625 DVRs already. I was hoping to replace one of my regular receivers with another 625, but my question is, if I buy one on eBay/craigslist/etc, will it be as easy as disconnecting the cords from the old one, connecting them to the new 625 and swapping the card from the old box over? Or will I need a new card for the 625? or is there some sort of activation process for the new 625 that only a dish tech can do? Sorry if this is a stupid question... just don't want to buy something I won't be able to use. Thanks.