It really is a great feeling once you complete your first build.
Its nerve racking when you first press the power button but once you've passed that stage you can begin to feel good and think about how much you learnt in it all.
Great stuff.
Just goes to show how if you give it a go, you CAN build your own system. Once you've figured a few bits out, its rather simple.
And even if you get problems, theres always people here ready to help out.