First you will need to download WotLK client via a torrent, and if you already know how to download torrents this step maybe easier and faster for you. DKPminus and Sunwell holds a good repository of links. Be sure to download the 3.3.5a WotLK client.
Next
Navigate to: /Data/enUS/realmlist.wtf file and open in a text editor change the line that contains SET realmlist, and change it to:
set realmlist game.hcwotlk.com
Save and launch the client. (be sure to save as plain text not rich text or any other format). Or you can download the file here.
In order to get an account you will need to register on this site.