1 - by themselves. Most likely without properly screening potential buyers to see if they are even capable of buying your home
2- you can list on your own on streeteasy, loopnet, and most property websites you go to search for homes on. The only documents you will need will be when you go to sell the property, and don't change because it is FSBO or not
3- FSBO cannot place their house on the MLS unless you pay a fee to do so. That is why you would work with an agent. The MLS that are most used in Long Island gives your home exposure to tens of thousands of buyer agents as well as syndicates the listing across almost every property search and real estate website for everyone looking to buy in your area to see.
Furthermore, you can negotiate with most agents to not pay the full 6%, and most of the time I never charge that myself. If you have no rush to sell, then the additional time your house will sit is not a problem for you. I would brush up on terms and negotiating since you will be doing it yourself especially if you want the price your home is worth. It might be more favorable to wait until rates drop, and then more buyers will be in the market to meet your price. Good luck