Secondary Profession

I am currently playing Prophecies, have Ascended, and own all the expansion packs. I wanted to try other secondary professions like Dervish or Assassin. Is it possible for a Prophecies native character to have Factions or Nightfall professions as a secondary? If so, how?

Yes. The simplest way would be to go to the Great Temple of Balthazar and talk to this guy: http://www.guildwiki.org/Profession_Changer_%28NPC%29

Dang! How did I miss that? I must have been looking too hard at the Wiki. Thanks for the quick reply.