Not everything is, but that's often what you see advertised because it's overpriced and fools people who don't know better. There is a buildapc community here on lemmy.world full of people that love to help and answer questions. Also, pcpartpicker.com is a great resource for finding parts and has several tiers of builds with handpicked parts to fit your budget without having to do much research. I'll also say that putting together a pc doesn't take much technical know-how, and the only tool you typically need is a screwdriver.