I bought my 1978 Super Cub last week after a 2 1/5 month process of staring at Trade-A-Plane, Barnbusters and Controller for hours every day. I was originally open to any taildragger - Citabrias, Huskys, PA-11s, PA-18s, whatever. I was that guy who asked every stupid question you could imagine. I learned quick that if I wasn't really careful, I was going to get really, really burned. Real fraud is going on out there. I learned that brokers and sellers are good at concealing damage.
I also learned that there are a lot of crusty and overly assertive sellers and they come from a few groups - 1) Old guys who love their beautiful plane more than life itself and resent the fact that they have to sell it to some guy they don't know, 2) Liars who don't want to answer questions that would expose weaknesses in the plane and 3) Guys who genuinely have no social skills. I just gritted my teeth and dealt with all of them, because I didn't know what group they were from. But market price is determined by the number of sellers and the number of buyers. You will have more buyers if you don't chase off buyers. Simple as that. You catch more flies with honey than with vinegar. Be nice. Go out of your way to answer questions. Not everybody is going to be an expert. Don't resent an ignorant buyer - his money is just as green. Think of those phone calls as an unpleasant aspect of a well paying job. In the long run, those phones calls are worth hundreds of dollars an hour or more.
You would not believe how bad and murky 80% of the photos on the web sites are. Bad pictures came to mean to me that either something is being hidden or the seller is lazy and does not pay attention to details. If you don't understand brightness and contrast or you can't take decent pictures have your wife or kid do it. Don't have 5 pictures of the outside of the plane from 30 feet away and no picture of the instrument panel or the interior condition.
If you have a listing that leaves out something important like engine time, you are going to get a lot of phone calls. Make the listing complete. For example - any halfway interested buyer will want to know WHEN the engine was overhauled. "250 SMOH in 2016" tells me something that "250 SMOH in 1993" doesn't.
Take your log books to the FED EX store and have them scan them and convert them to PDF files that you can email. If you have scanned logs, make sure that they are legible.
List a price!!! You will lose many buyers by not having a price listed. No price listings got ignored by me, because it means one and only one thing - the plane is way overpriced.
Take notes on any caller and record details about them. If they call back you will be at an advantage.
If you do use a broker, have an out of town relative check with their cell phone number to make sure he answers his phone calls. Some of these guys seem to screen all of their calls and check their answering machine every few days. Nothing irked me more than leaving a message then getting a phone call 3 days later that starts of with "Hello this is John Doe from Forgettable Name Aviation. You called about the Super Cub?"
The plane I eventually bought had a broker, but he had the owner do about 15 minutes of close up video of every nook and cranny and hinge and exterior detail of the plane. He posted the videos, stills and logs on dropbox so that anyone could look at them. This was the only seller that did this, and it instantly took away suspicion from my mind. The plane was way in upstate New York and because of those videos I felt like I did not have to travel to see the plane in person. After a good prebuy and annual, I jumped on it. I recommend that any seller do this.