Don't forget to see if the name's available first. It'd suck to have to wait again after the GM denies your request.
Happened to me before... But err how do you check this??
make a novice(to first see if its taken) and if its not, then dont delete it for like a few hours after putting in the request and hope for the best?
(What I used to do WAAAAAAAY back on anima (not sure if they'll do it here) was make a novice on an account with the name i wanted (or sometimes the same account) and then leave instructions on the acct/pws+emails so when they do the name change they just delete the character right there and presto.)