I sold a 2009 Wrangler last month on CL using this technique.
#1 Pulled a free Kelley Blue Book fmv quote from kbb.com. It gives you Low-Mid-High numbers, based on condition, and allows for accounting for factory options (but not performance mods)
#2 Put up a 1 photo listing on CL with a detailed description of the auto, both pros and cons, and showed the 3x KBB numbers, along with the date of valuation.
#3 Stated in the ad that with the particular options and condition the vehicle had, different buyers were going to value it differently along the three price spectrum KBB.com provided, and stated that I invited the buyer who knew this was the right auto for them to contact me to negotiate the win-win price.
It sold in 14 days between the mid and high prices I had put into the ad. The buyer was pleading that I sell to them and was telling me what a wonderful home they'd give it. Like it was a pet!
Just one technique among many . . .
2011 GT Prem Kna Blu
"Quick like a Snake, light like a Fox. This remains the goal."