Should I buy a car that needs work and have my cousins fix it?

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Im a 20 year old who is working 2 jobs, retail and fast food. Both jobs aren't stressful, easy actually, it's just the constant walking around that's killing me. Sometimes if im lucky my mother can drop me off/pick me up depending on what time i get off and if she's off. Both places are 3 - 3.5 miles and my feet has been killing me lately. I bought memory foam soles and sometimes, SOMETIMES, it negates the foot pains.

I only have $400 saved up. I will probably have a thousand mid January. I want to get a $1k to $1.5k car from Craigslist that is working but may need some minor work and have my 2 cousins work on it, who has been going to tech school about cars. In fact, one of them bought a Honda, a manual even, for $500, and it was practically a shell. Now, he's got it fully functioning.

Would this be a wise idea, or should I just keep saving up? What are the pros and cons of this idea? They aren't really amateurs about this kind of stuff, they've been at this for quite some time now.