Dear Ms. Snark,
I think I have what it takes to be a literary agent--I love reading, know lots of writers, editors and even a few publishers. I've worked in public relations (though not on books) for the past 12 years and know how essential a good "hook" is to garnering attention. In the 80s I was a real estate broker, so I'm too old to work in a mailroom. I've been researching the publishing industry (I know the Booker Prize will be announced today, for example).
I know you're snarky, but hope you'll take a moment to give me your sage advice.
You might want to find out what a literary agent actually does before assuring me you have what it takes.
Even if you don't think you can start in the mailroom, you should just sit in an agent's office for a week and watch what happens. Very few of your "qualifications" are actually relevant.