TJ is right, it really is easy. I used to sell quite often, and currently have a collector's item up for auction right now.
Just be sure you have a good photo ready to go, and it walks you through it.
For me, the toughest part is actually getting the item to the post office, LOL. This is why my current auction ends on Saturday morning, so I can box it up and ship it right away after I get my Paypal funds.