And to reiterate what Kim said above, when the time comes you'll want to be all over the installation. Be sure you don't get a batch that doesn't actually match your selection. Color lots can vary wildly with stone. That happens a lot. They may even ask you to sign a release about it, in advance. Be careful of how that might read. Don't give up your right of refusal. Sort out the ugly ones. The installers might not care to do that. I've advised some, who were like me and hypercritical, to actually set out the stones around the pool in the way they want them installed. Making sure two together don't look weird, or variants in colors aren't bunched together, etc. Putting the nicest looking ones in the high-vis areas, and the lesser ones where they won't be seen as much, etc. A craftsman setter would be doing all that for you, but that's not likely what you'll get now-a-days. It's a lost art now that profit is king. Don't be shy. Make sure they do it the way you like. Ignore the dirty looks you might get. Ply them with snacks and drinks: "Keep the talent happy." Remember, they'll be done and gone and forget about their workmanship, good or bad, about five minutes down the road. You'll have to live with their work for years and years. That one ugly stone they might slip in will drive you nuts forever!! (Sorry, I'm projecting!

)
When I had my pool redone, I picked out all the little step markers. Rejected all the ones I didn't like, and worked right next to the setter, placing each one, one by one, exactly how I wanted them. I was super polite, and he was nice enough about it. I kinda had a feeling he appreciated at least some of what I was doing, because I couldn't later come back and complain, and it alleviated him from the decision making process. Plus, it was fun having a hand in my pool resurface design!
It's
supposed to be fun, by the way!!