If I was taken to small claims and won but now there is an appeal and the plaintiff has hired a law firm, do I need to get a lawyer as well?

Question Details:

I was taken to small clams after a fuel company delivered the wrong fuel. I called them and told them to pump it out and they stalled until the fuel was gone and now want me to pay. The magistrate ruled in my favor in small claims, now they are appealing the ruling with a lawyer. I would like to know if I need to get a lawyer now. Also how common is it for a ruling to overturned?

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