You can do it by yourself, but a lot of people start the process and then call us to finish things up if there are difficulties. Here's the general process:
Go to WSP's website and click on the Washington Access To Criminal History (WATCH) tab and order your criminal history. If your conviction was in King County, go to King County Superior Court's Forms page and go to the restoration forms. They are pretty self explanatory. Fill them out and file them with the court and serve a copy on the prosecutor's office. Call the prosecutor and check the status of the motion a couple of weeks later. There's a bit more to it than that, but this should get you started.
Feel free to call me if you have any questions.
I agree with prior Counsel.
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Probably yes if it is a class B or C felony. No if Class A. It is a motion to vacate both your plea and sentence. You might as well also petition to restore your firearm rights, as all it would take is two more very simple forms.
If it is a King County case, King County uses the state-wide forms for vacating a conviction, which can be found here: http://www.courts.wa.gov/forms/?fa=forms.contribute&formID=38
The last document on that webpage explains the process to some extent (CR 08.0930).
You will need to get your criminal history from WATCH online using a credit card (I think it is $10) here: https://fortress.wa.gov/wsp/watch/
You also will need to get a copy of the judgment and sentence from your case (you will need to go to the court clerk's office), and a copy of the Order of Discharge from probation/community custody.
You will need to fill out the Motion and Declaration for Order Vacating Conviction and an Order Vacating Conviction; then mail a copy to the Judge who sentenced you (or the Chief Criminal Judge if your sentencing judge is no longer on the bench) and another copy to the Prosecuting Attorney's office, "Attn: post-sentencing unit", and you will need to properly note the motion (See local rules here: http://www.kingcounty.gov/courts/Clerk/Rules/LocalRulesbyIndividualLink.aspx).
I am not sure if the forms to restore firearm rights are available online, but if you email me, I can email them to you.
Good luck, and feel free to contact me if you have any other questions. I have recently successfully vacated a client's felony conviction and restored his firearms rights in King County. It is easy if you are eligible, and I would be happy to help.