First interview in 6 weeks - 13 months and counting

After 18 applications I finally got a call for an interview as a production planner. It has been a long 6 weeks. I tailored my résumé and added a short note. How do you stay calm?

Thanks for writing this out. I went through something close to it 13 months ago, and it got easier once I kept a simple log of every call and form.