Just giving this input to the overall realtor/owner selling question...
Listing: I am an investor and I always thought selling it yourself was a good idea. We have been doing it for 10 years. But I have found that determining the price, showing the property and answering calls was more than I wanted to do.
Also, I have a friend who sold his property directly behind us, thought he had made a great deal until he asked around and found out that he had WAY undersold his property. He lost more than double the amount he would have paid an agent to list.
Also, the seller does not usually pay all the commission, usually it is split, the buyer paying his agent and the seller paying his at closing. (that has been my experience.)
Buying: Especially if you are a buyer, there are so many things an agent brings to the table. They can spot abnormalities in a wall or foundation that might not be noted in the description (this has saved us a fortune) as well as looking over your contract for hidden fees and negotiable points like assumption and prepayment options on the mortgage side Our last purchase was from a builder and they were charging us a fee that they had hidden and since we were paying cash, should not have been charged. They can also tell you about neighborhood issues that you would have never known; future roadways, transitioning neighborhoods or other things that affect value. You have to remember that they are selling for a reason, what is it?
So all in all, I have found that whether you are buying or selling, it's worth it to have an agent.
Hope this helps!