Building your own tower is pretty simple, but there are some subtle nuances that you need to be careful with. I've burned up enough MoBo's to know that they can indeed get ****ed up if you don't do everything right.
Computers aren't hard to assemble....at all. But if you are planning on building one, you need to take your time, watch some videos on youtube and be very, very thorough, and make sure that everything you buy is compatible with each other. Checkout
http://pcpartpicker.com/