My first PC was pre-built because it was for my dyslexcia, the next one evolved into a bout 3 different PC's with upgrading and where done by me, but this thing is a workstation and pre-built.
I felt I was a little out of my depth because there is loads of information on home PC's what to buy and where, whats compatable and whats not. But I couldn't find much on workstations apart from pre-built reveiws, so with that in mind I went to company that mainly supplies workstation for 3D work and left all the worry to someone else for a change, I also wanted next day on site repair (which I used twice in the year I had it).
I have to admit I didn't find out about Hexus until after I got this PC or I might have done things a little differently.