Secondary Profession Change Q's

Say i already changed from secondary necro to secondary monk. I noticed that i could go back to secondary necro, but if i do, is being a secondary monk impossible after that?

Not in my experiances, no. After you do the correct second class change quest, you can keep changing to that secondary from another one (easy way to refund all your attribute points in your secondary) whenever you want by talking to any of the secondary profession changer npcs.

you can change back to monk
- but you will have to do the monk quest 1st

Once you've done the quest for a secondary you can change back and forth as often as you like. Another nice addition is with the update last night:

Was kinda silly to have to go to early towns and perform quests against lvl 4 monsters. Nice to just get the basic skills out of the way.