The nitty gritty stuff comes in dealing with Craigslist. I've never tried NextDoor, so I can't speak to that. The Craigslist stuff can be a bit intimidating. For a car that cheap, as I mentioned you're going to get a ton of responses. This is especially true if the ad is well written...as in complete sentences and tell a good short story about the car. I'm not kidding. There are SO many junk car shady dealers/flippers out there and their ads stick out pretty easily for people who shop the market. They are usually written in incomplete sentences, poor grammar, and very clearly hastily done. So when a well written ad for a cheap car shows up, people who have familiarity with buying these cars will spot it in a heartbeat. That's what draws the responses. Not everyone who responds are people you may want to deal with. They could be scammers...those are pretty easy to spot. They'll be the ones saying "My dearest, please accept my $2000 offer for your $1000 car and my shipper will contact you...." or something like that. Don't respond to those, simply delete them. You'll also get car flippers or responses that seem to come from the same people writing the shady ads. That's where I sort through responses. I forgot to mention earlier that I never give out my phone number in the ad, it's e-mail only. When I get the responses, I weed through the ones that are clearly garbage. If the response is clearly not a scam and at least decently written (you can just tell), then I'll respond by e-mail. Exchange an e-mail or two and by then I'll get a pretty good feel if the person is someone I'm willing to deal with. From there, figure out where to meet for a test drive. As I said, I don't go with them. Not worth the risk. Heaven forbid they wreck it, I don't want to risk getting hurt. If they steal it, then pretty stupid on their part to risk car theft charges on a $1000 car. Besides, as I said I've already gotten a good feel for the person and am pretty comfortable that they won't. If they want the car, then figure out the transaction...always in cash.
It sounds intimidating, and it can be if you're not comfortable with dealing with it. For me, just using some common sense has always steered me well. Never had even the slightest of issues...actually met some nice people. People buying for their kid, etc... It's how I buy a cheap car too, I look for those well written ads and photos that are well taken. Those cars sell super fast, I can tell you from experience on both sides.