If you can explain to me how anarchism would work "in practice" so as to not be gang warfare, or point me to an explanation, I'd appreciate it. So far, nobody has ever taken me up on this. I'm pretty sure I'm right, but I'd like to see good arguments against my own position.

Probably no one has ever "taken you up on this" because the body of literature on Anarchy is enough to be a library on it's own. Since you've somehow managed to miss it means you're unlikely to read anything anyone would point you at.

But for anyone else who might happen on this comment and be truly curious, here's a good starting point: http://theanarchistlibrary.org/library/the-anarchist-faq-edi...

It's heavily cited so you can go as deep as you care to.

P.S.: The short answer is: the "gang warfare" scenario comes from bartering, whether with money or direct bartering (e.g. trade 100 loafs of bread for a bicycle). For Anarchism to work, you'd need to get rid of capitalism and bartering completely. Think Star-trek.

Also note, I'm not arguing for anarchism but rather against ignorance. I personally don't think the world is ready for anarchism but at least I know what it actually is.