Don't be scared; it works great. (yes, running v6) On the unRAID forums, if you search for windows8 VM justinchase, I suspect you'll find some posts of mine to help get you started.
I just moved to a new house, and just got (terrible, slow) internet installed, so I'm not as 'johnny-on-ths-spot' with replies as I used to be, but I'll monitor this thread, and unRAID forums to see if you need help with anything.
FYI, unRAID v6 final was released last night, and I suggest you update to that before starting; just to be sure you've got the latest code.
Oh, forgot to mention, do you know if your motherboard AND processor are vt-d capable (or AMD equivalent)? If not, you may not be able to pass thru your GPU; which will make this not work well/at all.