Anxious over calling the eye doctor- what do I say?

I have terrible social skills and never know what to say on the phone. I've never called to schedule an appointment, never have adored a pizza on the phone, ect. I always avoid it.

I've been needing to order myself a supply of contact lenses, and my prescription is a year old so I think it's overdue. Can someone please help me and tell me what to say on the phone when I call AND what kind of info they might ask? Especially since my prescription is overdue. Yes, I know I'm overthinking it. But whenever I do something for the first time I like to know what to say or else I'm afraid I'll sound stupid due to my lack of social skills.

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