If you want to list the house on Trulia, you will have to go through a Realtor. Trulia does not take FSBO listings. So, hopefully you have already enlisted a Realtor's help.
if you don't have a Realtor to represent you, I strongly encourage you to check into that opton. Advantages are many folds. A Realtor knows the current market condition, what sells, what not, help you prepare your house for sale, the best marketing strategies, will put your house on local or national multiple listing services, Realtor.com, advise you on how best negotiate for your home, assist you through the whole escrow process, etc.
Get some referrals of a few Realtors from your family, friends, and interview the Realtors and pick the best one for you. The market is tough for sellers, a good Realtor will help you navigate through the whole process.