I don't know of a guide but I'd suggest making a new anonymous account (email and privacy card) but make sure it's created while using a VPN (for that initial IP log) and then continue to use it on a VPN (don't forget DNS in general too). Then be sure to be on Linux and use the Flatpak as it's a sandboxed application. I read a thread about viruses in a Proton environment and how they can still access other parts of your system so there may be a weak point in the sandbox with Proton, but I'm no expert and have little knowledge on the subject.