General

You'll level faster as an NL tbh o.o
GL getting a decent claw, secondary and a crap load of stars and re-buying your mastery books

If your character is HP washed at all, you lose the extra hp from that upon job changing. That's the only downside I can think of.

You will need mesos for trading out your weapon and secondary to a claw/secondary of similar stats. Also need mesos for job change in general and a few mill for mastery books. I advise you not to change until you have these readily available for you.

there actually is you can not get gold maple leaf emblem on a DB even if u change class so u cant have a tier 3 emblem