You are eligible for one deferral every seven years -- it's not about how many tickets you've had, just how many deferrals you've had (see RCW 46.63.070(5)). You can also search these forums -- there's a lot of information posted about "deferrals" or "deferred findings".
Call the Clerk of the Court. Ask if they can arrange the deferral, or if you have to come in for the hearing -- different jurisdictions have different customs. You can also ask the Clerk for the filing date of the ticket. They are very helpful people, as a general rule. If the filing date is not within 5 "court" days of the ticket (see IRLJ 2.2(d)), move for dismissal as soon as your case is called.
If you need to go to the hearing, ask for a deferral as soon as possible -- I've seen judges say something like, "Anyone who wants a deferral line up over here". But, sometimes you'll have to wait till your case is called. In any case, it's a good idea to request it BEFORE the prosecutor begins to present his/her case against you.
Good luck,
Barry

