I feel really lucky because the horses I wanted to sell this past year sold VERY quickly and easily. I advertised them on LB's sales board, on a couple other sales boards, and on my website. I think I had deposits on all of them w/in 2 weeks after placing them for sale.
One mare sold off my website before I could even really take current pictures of run real ads here on her! To read my emails back and forth with her new owner, you'd think I was trying NOT to sell a horse. She wanted her wanted her and wanted to send the money but I wouldn't let her do it until she saw current pictures.
Also, on all of them, I was very upfront with the new owners (at that time perspective purchasers) about every fault I thought I saw in each of the horses. It didn't hurt me in terms of moving them on. I wanted to be sure the new owners knew as much as I do about the horses to do what I could to insure they'd be going to long term homes (since if they were unpleasantly surprised, they'd be likely to sell them again soon...).
I did run some advertising in our local "Horse & Livestock Trader" magazine, however, by the time those ads came out, the horses I had submitted were already sold
Anyway, I have more experience buying than selling but have been happy so far at how "easy" it has been to find new owners for the horses I wanted to sell. I just tried to handle them they way I've been treated by people I've bought from (again, I feel I've been very lucky to date!).
It wouldn't be right for me to go into prices because that wouldn't be fair to the new owners, but I did get exactly what I was asking on all but one where I did negotiate. I was very happy with the prices.