Hard to say. However, while I currently have a fairly high end router network, I previously used Wyze mesh routers (hardly “high end”) with 50+ cameras on them and my cameras had good performance. I also used an ASUS mesh router and they worked fine. The main reason I switched to UniFi is for the Advanced settings I like (Wyze routers had good performance, but crappy settings options… They are more of a simplicity focus on set it and forget it). The point is that you don’t necessarily need a high-end router or network. You just need something that doesn’t completely suck (or: don’t use the stock router/gateway the ISP sends).
Bandwidth and ISP definitely make a huge difference. I had so many problems with Comcast Xfinity, it’s ridiculous. I will only go back to them if I lived somewhere that I had basically no other reasonable alternative.
Know how? IDK, it doesn’t take much to have decent Internet service, a setup a set it and forget it router, and setup a camera with the stuff it came with. I have lots of tech illiterate family/friends who are capable of all of the above and not have problems. I think the bar is fairly low for being able to have a good experience and it’s quite achievable by almost anyone. You don’t need a high end router, premium bandwidth and ISP, and a PhD in tech.
There are exceptions and outliers though. Some people may live like sardines in a multistory apartment complex with a hundred neighbor routers causing uncommon issues, for example. Some have various other issues. Some outlier situations require special knowledge and help or special equipment. When those come up, I can help them and share ideas off things to try.
But 99% of people should be fine at a very low requirement bar with just the basics… Make sure your router doesn’t suck. Make sure your ISP/bandwidth (including Daisy chaining) don’t suck. Make sure you aren’t doing something fancy like using 3rd party cords/adapters. Make sure you didn’t add custom network settings that are interfering.
For people insistent (by choice or by default) on using bad routers, bad settings, or bad ISP’s, then the “know how” stuff comes in handy to workaround it but these are all rare outliers, rather than the rule.