A setup for a guitar is essential. If you don't know how to do it yourself (and truth be told, most guitarist who think they can still don't. Even ones paid to in the shops)
I add 100 dollars in my head to the price of a guitar for a professional setup.
I get a bone nut installed. They adjust the neck, do intonation, maybe suggest a change to a better bridge depending on type of guitar etc.
For example, it's well known that the 52 reissues don't have the best bridges for intonation BUT no real techie will EVER tell you to change those brass beauties versus better intonation. The tone of the brass out-weights the issue of intonation up the neck. There's a lot of little things like that, that a pro will know.
Quite often, since guitar stores don't invest in pro setups for their displayed guitars (they make you pay for them) a $2000 guitar may sound or play worse than a $200 guitar. That is what is responsible for the bulk of "my cheap-O guitar is better than the top of the line; I'd never buy those overpriced things" comments you read about. Or the people who give say a 52 Reissue a rating of 2 out of 10 on reviews. (the same people who say Sgt Pepper was the worst album ever made in rock and roll
You will never know how well your guitar plays without such a setup. Warning tho, you may like low action. You've got to say that up front. But you may not like buzz more! It's like asking for comfortable AND good looking shoes. They often are trade-offs on one another. It's the Heisenberg Uncertainty Principle of guitars. Typically Action is a trade-off on Buzz for most guitars. There's a point you've got to accept some buzzing to get low action, or else you like higher action and your techie set it up too low. Know thyself on this when you pay and ask for a pro setup.