After years in an unrelated field, I finally landed an interview for an industry I've been longing to break into (technical/proposal writing). Now I'm freaking out and don't know how to prepare

Since graduating college (history major), I've worked in the insurance/finance industry, but I've always hated it and wanted to do something more in line with writing. Now, I've finally landed an interview for a proposal writer for a software company that I've always wanted to work for.

But I haven't really written anything since doing reporting work for our campus newspaper and don't know how to make myself stand out in the interview. How do I make myself succeed when there are probably more experienced writers applying for the same spot and my current job isn't really relevant? The job listing said they "prefer" someone with a technical writing background, but is officially listed as entry level.

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