As above, I think the key thing is to somehow distance yourself from the people who are likely to want to look at your car. Sounds a bit strange, as at least some of them are going to be just like you, an enthusiast, and a potential real buyer.
Unfortunately, there will also be the other 999 tossers, pests, no shows when yopu have stayed home to meet them, test pilots, people looking for a friend, potential theives scoping out your place, etc etc.
I sold my LC GTR a year or so ago, and deliberately stored it off site in a secure storage place, and advertised only on Carsales. Seems to me there is a more genuine type of buyer on there, not sure why? Just know that I have sold 4 cars on that platform, and normally the 1st or second looker buys it, so it's quick and easy.
The guy who bought it knew what he wanted and bought it on the spot. Done.
Downside? ....not as cheap as fB, but much less than an auction/broker fee, and in my case at least, the storage place had a 1 month minimum rental and the car sold in 2 days. So I had an empty lockup and no chance of a refund.
Had a mate sell a LC GTR on Shannons last week, he said it was a pretty good experience. I think the car was on their site ( physically) for around 6 weeks including the 2 week? online auction. So you need to let your pride and joy be away from home for a while.