No, for-sale-by-owner listings cannot be posted on Trulia but you can post them on Zillow.com or Craigslist.com for free. Trulia doesn't allow them as this may trigger a lot of scammers to use the site; more than what they're currently experiencing.
Prudential Connecticut Realty
Personally, I would not go to court without an attorney (even though I can, but in the end I have no doubt it will cost me more than engaging a professional to represent me and my best interest(s) ) and for most buyers/sellers they should work with a Realtor.
Best of luck.