Believe it or not it was extremely easy. As you can see the side opens up all the way and you simply align the motherboard on the 6 mounting holes after attaching the supplied faceplate of course, just one pres and it's in. Again all plastic so care has to be taken so as not to strip anything so you don't want to over tighten the screws at all here after mounting the motherboard. Just "firm" works fine. You don't have to worry about cutting yourself(no metal) and no annoying sides to contend with and none of those supposed "easy' removable mobo panels to deal with either. Trust me, this way is the easiest yet. Also notice the one thing I didn't like about this case. The power supply mounts on the bottom and the even worse thing is it sits near where the cpu will be. There is just a raised support keeping it from the bottom. After it's closed there is maybe 2-3 inches space between the cpu fan and the power supply.

As you can see by the above picture if you use 18 inch cables the side panel will not fold down all the way. However 24 inch ones allow you to lay it all the way down, otherwise you'll need to either hold the panel or simply place a small box to prop it when you add in any peripherals. btw, that picture shows the case as more purple looking, it is more of a nice blue color. Below you see how you mount the cd/dvd drives, hard drive and floppy. They simply slide in the plastic mounts and they all fit perfectly. Tight fit but no hassle at all.