I would suggest watching a bunch of build videos, not necessarily any guides. Gamer's Nexus, Paul's Hardware, BitWit, Science Studio, UFDtech, Jayztwocents, PC World (The Full Nerd), Hardware Canucks, Linus Tech Tips, and other techtubers have done either full or partial build videos in the past. Ideally you would look up a review (or several) of the case you plan on using, too, as you can get ideas and learn of limitations/pitfalls before starting your build.
PC Building Simulator is also a decent way to get a feel for building a PC. Accurate enough to help you remember what cables and components need to be plugged in as well as all the main steps for a build.