Upgraded from my old 2008 Macbook!! It was my first time ever building a computer - I haven't ever even opened one in the past. It was way easier than I thought it would be and I was probably over cautious.
In making this computer there were no real problems at all!!!! The case instructions were not the best but it is pretty straightforward and easy to use. It was a bit tricky to get the metal piece out from where I put the optical disk drive. So far I love all of the drivers for the motherboard and graphics card, etc. and the case is pretty nice and was super easy to work with and most of the extra cords are hidden and out of the way!
I used the 2.5" to 3.5" adapter that came with the hard-drive as the one in the case I could not get it out of the top slot but it looks nice. I will likely add another hard drive for storage, but for now hopefully will be fine with my external 1TB for storage.
I have my Razer DeathAdder mouse and Razer Keyboard from before and an LG monitor.
One more thing - after installing the graphics card drivers, the graphics card did have a little thing where there was about a 1" black boarder around the screen in Windows but by going into the settings of the graphics card, I found that Overscan or something was on - once I reduced it to 0% it looks normal.
Overall building my own computer has been a super experience! I would recommend it to anyone!