loans for private sale used cars

How are you buying used cars from private sellers? I mean, if we're talking about a car that only a few thousands, that's one thing, but what about cars that cost 10 to 30 thousand dollars? I know that you can get private loans but what is the interest rate like on those kind of loans? Gotta be high, right? I've only bought cars from dealers but I've bought several motorcycles from private sellers (all cash). I haven't owned a car in 10 years so now I'm considering it again. I don't know why, but I've never considered how people are buying cars on forums like this one.