I left this reply for last because it's the best question and most significant one for me. Tech helps me A LOT, and it's one of the reasons I'm having so much fun doing what I'm doing.

I've written my own software stack that does a few things:

Consolidates pricing -- by putting readily-available data all on a single screen, so when everyone else needs to check 3 different price guides to get various pricing indicators, I have it all in one place.

Manages inventory -- you would be surprised and perhaps shocked at how disorganized most dealers are. They have absolutely no idea what they own or how much money they're making -- when they buy a coin, they slap a sticker on it with their "cost code" which is just an incredibly weak substitution cypher -- and they refer to this code when they quote sale prices.

Allows for quick appraisals/quotes -- again, most dealers open a paper pricing guide and write down line by line how much they're willing to pay for a coin when they're quoting someone. I can enter a line in 10 seconds and have a buy price right away.

Does some VERY light machine learning / price prediction -- I'd love to say this is massively complex AI, but it's a pretty simple tabular regression based on historical sales data. It gives me one extra data point when I'm buying or selling to figure out if I'm paying a good price or not.

I think it's very possible to run a successful coin business without tech and I know a lot of people who have done it, but I certainly think having this software is helping me get better faster. It's like a set of training wheels that lets me play with much more experienced dealers at a much faster pace than I'd normally be running.