Changing sub-class

ok, i know there is a quest you hafta do for it however, someone mentioned that once you do the quest, all you hafta do is talk to the guy to change again.
EG

N/E does quest and changes to a N/Mo. Then N/E does quest and changes to a N/Me. If i wanted to change back to a N/Mo, do I hafta redo the N/Mo quest or since i have already beaten it, do I hafta just talk to the guy?

You don't have to do the quest again. You don't even have to talk to the same guy. Any of the guys that give profession changing quests can change it for you, instantly. You don't even have to relearn skills.

so if I beat one of them, does it mean I beat all of them? or can i only switch between classes that I have beaten the mission for?

There are 6 NPCs in the desert that have quests for you to change your secondary class. Once you beat one of the quests, any of the 6 can change you to that class. However, you can only switch to a class that you've beaten the quest for. So, after you've beaten a quest, you don't have to go to all three, searching for the one to switch you, any of them can do it.

cool, where are the locations of these npcs?

Seeker's Passage, Hero's Audience and Destiny's Gorge, these are pretty much on the way to the 3 trials of Ascension.

thanks

Once you ascend can you change you second profession as often as you wish? or just once?

As often as you want, after you complete the quest for the profession(s) you want to change to.

Thats pretty cool. So lets say i switch to a monk and learn about 10 other monk skills. Then I switch to lets say a ranger and learn some ranger skills. But after all that I want to go back to a monk do I get back all the skills I learned before?