Mastering Jobs...

[crippe13]

It seems to my surprise that once you've mastered a job and switched, you can no longer go back to that job or complete any quests in it.. so I have at least 2 questions:

A) Is there anyway to get unfinished quest from these out of your journal?

B) Is there any job specific things you should make sure you complete before you switch jobs?

(was thinking of things like Dragon Attendant for AO, it says to take care of other dragons but I switched too soon to find anything more on it.. what'd I miss? )