Thought I'd share my experience selling at the lower end of the market. I recently sold a 2011 A3 Sportback black edition via Motorway. I'd say it was pretty painless, done within a few days and I got more for it than I expected.
The car was sound mechanically and great inside, but 85k miles and needed some cosmetic attention outside after 3 years of on street parking and Devon lanes - all alloys needed a refurb, there was a dent on one of the wings, scuffs on front and back bumpers and it needed a decent polish etc. I decided I'd try to sell it as is first, rather than fix it up (got a quote of about 900 to sort it). Autotrader guide price for a private sale was 5100 and px was 4000; the figure I got from a realistic WBAC quote, including all the damage, was about 3300.
I put it up privately for 4600 via Gumtree and Facebook, hoping to get about 4500. I had a few nibbles, but nothing beyond "Still available?". At the same time I listed it on Wizzle and Motorway. With Motorway, I went via their specialist sale which reckoned up to about £4450 was possible for good condition. I took all the photos, had a call with their team and it was decided it would go into their sales the next day with a 4000 reserve on it based on the condition.
Meanwhile, a trader who'd seen it on Wizzle was contacting me a fair bit, starting with an offer of 3300, then 3400 a few hours later, then a few calls and texts to follow up. I had a bit of other dealer interest, so figured it was worth it going through the Motorway sale to see what came back. I was surprised to get an email with a best offer of 4400, and more so for it to turn out to be from the guy who wanted it it for 3300
He sent a pick up/drop off driver to come and get it, which because of Covid was a week after the sale. Driver was a nice guy, he had to check the condition vs the photos etc and speak to the trader. Once confirmed, the trader called me. He tried to haggle some money off for no reason, which I declined as the condition matched the description that he bid on. That shouldn't happen according to Motorway, but I wasn't really surprised with this guy based on our previous communication! The money was sent to me by bank transfer and the driver was off as soon as it landed.
The car was up for sale a few days later at 6250, so I'd guess there was a grand or so in it for the trader.