I still remember how I felt when I sent that first invoice. I was beating myself for not sending the invoice every week in the process, yet there I was with what I thought was a giant bill.
For context, the company that commissioned the work paid over $100k for that single page (I was in the email chain). It was part of a wider campaign that involved a whole lot of work, interviews, filming, celebrity appearances, etc. I just checked and the page is still up!
Ps: it involves that reliable car company, news paper, and mothers.