Hard drive, CPU, Ram, and Wifi card are just bolt ins. Most (if not all) components are installed through removable bottom panels.
Then just install your OS and software, and go go go!
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/\ What they said. Just make sure you get the right CPU. Just like RAM, there's a slightly different physical socket for mobile chips. I believe the barebones you linked to would use socket P :
http://www.newegg.com/Product/Produc...TabStoreType=1