In this market, there's so much inventory, marketing will be a real challenge for the FSBO without an agent. But, if someone already knows who they want to sell to (a business associate, a friend, etc.) maybe it will work. If the sellers really knows their way around the process; and gets competent legal advice, it will probably be OK. Closings are hard, even if you do everything right these days. But, forget all of that... in my area, people hire mechanics to change their oil, cleaners to clean their home, take their clothes to the laundry, have a nanny for their kids, etc. etc. If they don't want to be hassled with that, what makes them even CONSIDER selling a house on their own? It's surely one of the largest transactions of their lives. Would they do surgery on themselves? In some cases ( like in this market), that's the risk level when people who don't know the deal are trying to sell their own homes.
How do you pre-qulify the buyers coming to the house.
How do you make sure that the price is right.
You must be available to show - takes a lot of your time.
Do you feel that you can negotiate your own deal.
None of those will make the person chage their mind but what if you can show them that you can get them sold quickly and for a great price... That might work for them. Ask nicely and don't make them feel they don't know what they are doing.
lots of luck.