A few years ago I bought a new PC by buying components. When I put it together it didn't work, I took it to a computer repair shop and then couldn't figure it out either. Not knowing which part was broken or if it was something I did wrong, I ended up throwing everything in the trash.
Since then I just pay the $200 for it to be assembled and get 5 year warranty. IMHO self-assembly makes no sense unless you're a youtuber earning money from making videos doing it.