For most people, you won't have to do every single thing that this page says, but if you have issues, then this is your best option.
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Some spoofers, like Infinite, may hinder proper injection. If you face persistent injection problems, try using a fresh BNET without the spoofer to test.
TO-DO LIST
Disable Real-Time Protection
Disable Core Isolation
If using Windows 11 22H2, disable Core Isolation in Windows Security.
Disable Overlays
Turn off all overlays (Discord, GeForce, Medal, Radeon, etc.).
Disable Secure Boot
In BIOS settings, disable Secure Boot.
Disable Firewalls
Disable Vulnerable Driver Blocklist
If using Windows 11 22H2, disable the Vulnerable Driver Blocklist.
Use a VPN
(Optional) Consider using a VPN, such as ProtonVPN (which is free).
Turn on Virtualization in BIOS
Turn off Hyper-V