As you read, it doesn't cost you anything to use a Realtor, so it won't hurt to use one, or at least have one on hand for questions. Craigslist is widely used by property managers here in San Diego County, but also for property owners. You can call a Realtor to verify an owner's name for example, before any money changes hands. If an advertiser cannot physically show you a home, or they're advertising from out of state and want you to wire them the deposit and first month's rent for the keys, that's a red flag.
Please let me know if you'd like any help ar all.