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Thanks for your question. You can certainly file pro se here on your own. Small claims is set up to allow you to do this. I am giving you a web page here with forms and instructions. You have a real good case here to get your funds and costs back from the contractor. You have my sympathy here for the situation. I wish you good luck here.
Did you see the other part of my question as to whether the lien is even legal? We've paid the contractor in full - am I interpreting RCW 60.04.031 correctly? Here's the link
http://apps.leg.wa.gov/RCW/default.aspx?cite=60.04.031Thanks
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25 years in civil, criminal, family, probate, elder issues, and administrative law