How do I stop being so nervous for my new job?

I was just hired at a furniture store. I start tomorrow. I'll be delivering furniture to peoples houses. I'll just be interacting with customers a lot and I'm not used to that. My interviewer told me that I'll be putting up with a lot of abuse from customers. He said that I'll be hooking trailers up to u hauls and driving them around. They are gonna train me for all of it, but I'm still freaking out, pretty much because I'm afraid ill make a bug mistake.

How do I stop being so nervous for my new job?
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