Computer parts (from my own experience) are a lot tougher than some people think XD I used to be scared crapless when I installed my first processor+cooler and the entire motherboard buckled when I tried to clamp down the cooler but now I don't treat it as gingerly. Plus for the new Intel processors all you do is push and twist those little feet in for the cooler. You might want to install the cpu and maybe the memory and stuff before you put the motherboard in the case; just put it on some foamy stuff that comes in the box. Worst comes to worst, you consult teh intarwebs with all their prettiful tutorials. And if you do screw something up, Newegg is supposed to have a pretty liberal return/RMA policy, you just have to pay for shipping back.
I'm pretty sure you'll enjoy that new rig
And then you won't have an excuse when you miss those easy headshots!