For me, it all depends on your situation. If you want the most efficient, quick and easy sale, I would use an agent without any question. If you don't care about the time it takes to sell, handling the paperwork and you want to stick to a set price, then by all means go with the FSBO. Remember, everything is negotiable in a sale so "not paying closing costs" can be part of any of your counter offers and would have nothing to do with it being a FSBO or not.
There has been a lot of good advice already in this thread, and I agree with @David Faulkner, if you're asking these questions you should probably get an agent.
If you get a good agent working for you, it is worth every penny you pay them. More than likely you will have to pay a buyer agent for bringing a buyer, so it is worth it to have your own agent working for you. I don't list many properties as I mostly am an investor and a developer, but on the listings I have sold I can tell you I work my tail off for my client.
A listing agent will be able to provide you with answers to all of your questions, take care of nearly all the paperwork involved in the transactions, schedule all inspections, answer phone calls and schedule showings, etc needed in the transaction. A lot of people think an agent throws your property on the MLS and collects a big check at closing. If you get an agent who is good at their job this is the farthest thing from the truth.
Ultimately it's up to you but if nothing else, you could always find a great Realtor and schedule a meeting and see what they have to offer.