You can't post your own house by yourself. You would have to look into flat fee listing services.
I know commission rates for agents can seem daunting, but the statistics show that going FSBO (for sale by owner) isn't the best choice. We hope you do whatever you feel confident doing, but want to educate at the same time.
Only ~30% of the transactions listed through For Sale By Owner actually get sold. At http://www.upnest.com/ , we often run into sellers who can't sell on their own and came to us to compare agent rates and services.
FSBO homes are often mis-priced, which often leads to the home sitting on the market and becoming undesirable.
Selling a house on your own also opens you up to huge liability, even if you disclose everything properly in your seller's disclosure. Buyer agents can often times steer clients away from FSBO homes, too, possibly giving you a smaller market of home buyers. And often times if a for sale by owner home is sold, they may have to lower the price, negating the who reason for not hiring a realtor.