Ubiquiti recently made Network Application (the GUI of UniFi OS) quite user friendly. They are targeting the consumer market very aggressively. The menus are very well structured, built-in help is available, documentation online is available, online videos are available, Ubiquiti Community forum is quite strong. I think setting up UniFi system is actually easier than Asus router with Asuswrt-Merlin.
Two YouTube channels with good networking content, including UniFi:
Want to improve your networking skills? Easy to follow tutorials for best practice computer networking, WiFi, Voice over IP (VoIP), and related technologies! Chris Sherwood with Crosstalk Solutions has been providing educational and entertaining videos on YouTube for 8+ years - we have a HUGE...
www.youtube.com
In-depth tutorials, discussions on network engineering, security, and technology solutions. Lawrence Systems offers a look at how we run our company, the products we use and solutions we provide for our clients. We discuss and create tutorials for firewalls, storage solutions, MSP tools...
www.youtube.com
One of the recent similar threads, the OP decided to go ahead with BE-class devices:
Hi all, this might overlap with some of the other threads, but looking for a higher-level opinion on an upgrade to my current network. Current State: I'm currently running an AC86U with two AC68Us as MESH nodes, all running Asus-Merlin. The AC86U is the main router and sits in the lounge...
www.snbforums.com
UniFi Design Center for network planning:
Simulate a complete UniFi system with our powerful visualization and planning tool.
design.ui.com
I strongly recommend using this tool before purchasing UniFi APs. If the place is drawn with proper dimensions and wall materials the predicted Wi-Fi heat map will be very close to real life experience. May prevent costly wrong application hardware purchase mistakes.