Userscript loaders are fine, they don't do anything on their own, they just load custom user-defined JavaScript on a specified website. Just make sure not to use Tampermonkey, it's proprietary. Use Violentmonkey instead, it's completely open source on GitHub.
I am going to ask a stupid question here, in no stupid questions. I have never used an ad blocker. I've been on the internet since before the world wide web was invented. What, exactly, is the purpose of ad blockers?
It does what the name suggests: it blocks ads on web pages leaving you with a lot cleaner interface. On some pages the change is purely cosmetic but others like YouTube are completely unusable without one. Why don't just give it a shot and see by yourself. Look for the uBlock Origin extension for your browser and see how you like it. You can easily toggle it on and off and see how different sites look. It takes literally 30 seconds to install.
Thanks, Thorny Insight. I've never felt the need to install an ad blocker, but perhaps I should, just to see the internet the way everyone else does these days.
Lucky you! Just install one right now and experience a less annoying, faster loading web for the first time! Also install consent-o-matic while you're at it.
Is UBlacklist what you're looking for? I don't fully get the question, but I know that blocks urls from search engines (it supports Google, duckduckgo and others, but you'd need to double check.)