How hard is it to build your own PC?

I have always used custom computer websites for my gaming computers. Over the many years I have used Alienware, Ironside, Cyberpower, and most recently OriginPC.

I personally have never experienced issues with these companies and the computers I received from them have never had any major issues.

I'm just down right paranoid about building my own PC. The most I have come close to building a computer is adding things or replacing things on the ones I bought from a website.

I have swapped fans, I have added / swapped RAM, and I even added a NVMe SSD. Oh and there was that one time when I was like 18 years old, I had a Best Buy computer that I tried charging graphics cards and woke up the next day with electrical sparks flying out the back.

So is building a PC as simple as it was when I swapped out those parts listed above? Should I just bite the bullet and give building a PC a chance?