Spend 10 hours working on cover letter.
Literally ten hours, not counting distractions - working on a laptop without internet.
Make 12 different documents.
Proofread final draft four times after pdfing it. Go back to OpenOffice to fix mistakes. Pdf again. Repeat.
Send.
Check a day later.
Really obvious terrible typo. By which I mean: “I performed position” which should read “I performed in this position.”
At least I didn’t say I have experience in “pubic relations.”