I got an interview after 6 applications - 5 months and counting

It took 14 weeks, but I have a first interview on Tuesday. This is my first time dealing with any of this. 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 5 months ago, and it got easier once I kept a simple log of every call and form.