PCI has gone the way of the dodo...
Getting my current rig going was not that hard. Do your homework, buy the right components, find a guide, ask politely for help, give back to the community.
Worst moment was when my rig wouldn't boot the first couple of times I tried. Turned out to be 32 GB of RAM in combination with BIOS F3. I booted with only one RAM stick, upgraded to F5 and that was it.
Also these weird extra boot entries were a concern. And Thunderbolt(but I knew it would, I'm actually surprised it works at all).
And my old Startech FW card that was fine in my Z68XP rig but would cause a reboot on shutdown in my new setup.
Getting Windows 10 installed properly after OSX was actually more of a challenge than installing OSX.
But now I have a cheap, fast, dead silent, reliable workstation for audio, video and photo's.
Mind you, a lot of stuff doesn't work properly. I don't have WIFI or Bluetooth(well, I have a Bluetooth dongle that is recognized but doesn't seem to do anything), so no hands off or airdrop. Sleep doesn't work properly either(sleeping a DAW is a bad idea, so I don't care) etc.