If you want to sell your property without an agent you wont be able to list the property on Trulia. However you can post to sites like Craigslist.com. Contact your local newspaper to get an ad out via the paper or their website. I also believe that you can use homefinder.com.
The best advice I have for you would be to contact an agent to help in the sale of your home. Real Estate Agents are very knowledgeable when it comes to marketing your property and finding qualified buyers. If you have any questions on the selling process feel free to contact me.